Sentence Structures

Master English sentence structures: simple, compound, complex, and compound-complex. Learn to use connectors to build more sophisticated sentences.

Level A2-B1-B2-C1-C2⏱️ 75 min📋 Requires: Basic grammar, Understanding of subjects and verbs, Basic vocabulary
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What Are Sentence Structures?

Sentence structures are the different types of sentences you can form in English. Knowing these structures lets you build more complex, expressive sentences and combine ideas effectively.

📋 Quick Reference

1Simple: one main idea (S + V + O)
2Compound: two ideas joined (clause + and/but/or + clause)
3Complex: main idea + dependent idea (clause + because/when/if + clause)
4Compound-Complex: combines compound and complex
5Use connectors to link ideas

Simple Sentences

A simple sentence contains a single main idea with a subject and a predicate.

Simple Sentence Structure
TypeStructureExampleComponents
Subject + VerbS + VBirds flySubject: Birds, Verb: fly
Subject + Verb + ObjectS + V + OI eat pizzaS: I, V: eat, O: pizza
Subject + Verb + ComplementS + V + CShe is happyS: She, V: is, C: happy
Subject + Verb + Object + ComplementS + V + O + CI find it easyS: I, V: find, O: it, C: easy
🇪🇸 Spanish:

Los pájaros vuelan

🇬🇧 English:

Birds fly

📝 Translation:

Birds fly

🇪🇸 Spanish:

Ella lee libros

🇬🇧 English:

She reads books

📝 Translation:

She reads books

🇪🇸 Spanish:

Estoy cansado

🇬🇧 English:

I am tired

📝 Translation:

I am tired

Characteristics of Simple Sentences

A simple sentence:

Examples:
  • Has one subject and one predicate
  • Expresses one complete idea
  • Can be short or long
  • Is independent (does not depend on another sentence)
💡
Remember: A simple sentence can have many words, but only one main idea.

Compound Sentences

A compound sentence joins two or more simple sentences using coordinating connectors.

Coordinating Connectors (FANBOYS)
ConnectorFunctionExampleMeaning
ForReasonI study hard, for I want to passbecause
AndAdditionI like coffee and teaand
NorNegative additionI don't like coffee, nor do I like teanor
ButContrastI like coffee, but I don't like teabut
OrAlternativeI can have coffee or teaor
YetContrastI'm tired, yet I can't sleepyet / however
SoResultI'm tired, so I'll go to bedso
🇪🇸 Spanish:

Me gusta el café y el té

🇬🇧 English:

I like coffee and tea

📝 Translation:

I like coffee and tea

🇪🇸 Spanish:

Estoy cansado, así que me voy a la cama

🇬🇧 English:

I'm tired, so I'll go to bed

📝 Translation:

I'm tired, so I'll go to bed

🇪🇸 Spanish:

Me gusta el café, pero no el té

🇬🇧 English:

I like coffee, but I don't like tea

📝 Translation:

I like coffee, but I don't like tea

Forming Compound Sentences

To form compound sentences:

Examples:
  • Simple sentence + , + connector + simple sentence
  • Simple sentence + connector + simple sentence (no comma)
  • Each part must be able to stand alone as a sentence
⚠️
Watch out! Use a comma before coordinating connectors when you join two complete sentences.

Complex Sentences

A complex sentence has a main (independent) clause and one or more subordinate (dependent) clauses.

Types of Subordinate Clauses
TypeConnectorsExampleFunction
Timewhen, while, before, afterI eat when I'm hungryWhen something happens
Causebecause, since, asI study because I want to passWhy something happens
Conditionif, unless, provided thatI'll go if it doesn't rainUnder what condition
Contrastalthough, though, even thoughI go although it's rainingContrasting ideas
Purposeso that, in order toI study so that I can passFor what purpose
🇪🇸 Spanish:

Como cuando tengo hambre

🇬🇧 English:

I eat when I'm hungry

📝 Translation:

I eat when I'm hungry

🇪🇸 Spanish:

Estudio porque quiero aprobar

🇬🇧 English:

I study because I want to pass

📝 Translation:

I study because I want to pass

🇪🇸 Spanish:

Iré si no llueve

🇬🇧 English:

I'll go if it doesn't rain

📝 Translation:

I'll go if it doesn't rain

Structure of Complex Sentences

They can be organized in two ways:

Examples:
  • Main clause + subordinate clause
  • Subordinate clause + , + main clause
  • A subordinate clause cannot stand alone
✅
Tip: The main clause makes complete sense on its own; the subordinate clause does not.

Compound-Complex Sentences

A compound-complex sentence combines compound and complex structures. It has at least two main clauses and one or more subordinate clauses.

🇪🇸 Spanish:

Estudio duro porque quiero aprobar, pero a veces me siento cansado

🇬🇧 English:

I study hard because I want to pass, but sometimes I feel tired

📝 Translation:

I study hard because I want to pass, but sometimes I feel tired

🇪🇸 Spanish:

Cuando llueve, me quedo en casa y leo libros

🇬🇧 English:

When it rains, I stay home and read books

📝 Translation:

When it rains, I stay home and read books

🇪🇸 Spanish:

Si tengo tiempo, iré al cine, pero si no, me quedaré en casa

🇬🇧 English:

If I have time, I'll go to the cinema, but if not, I'll stay home

📝 Translation:

If I have time, I'll go to the cinema, but if not, I'll stay home

Characteristics of Compound-Complex Sentences

This sentence type:

Examples:
  • Has at least two main clauses
  • Has at least one subordinate clause
  • Combines features of compound and complex sentences
  • Is the most advanced structure
💡
Usage: Compound-complex sentences are useful for expressing complex ideas clearly.

Advanced Connectors

Beyond basic connectors, many linking words help you create more sophisticated sentences.

Connectors by Function
FunctionConnectorsExampleMeaning
Additionfurthermore, moreover, in additionI study hard. Furthermore, I practice dailyin addition
Contrasthowever, nevertheless, on the other handIt's expensive. However, it's worth ithowever
Causedue to, owing to, as a result ofDue to the rain, we stayed homedue to
Resultconsequently, therefore, thusI studied hard. Therefore, I passedtherefore
Timemeanwhile, subsequently, eventuallyI studied. Meanwhile, my friend playedmeanwhile
🇪🇸 Spanish:

Estudio duro. Además, practico diariamente

🇬🇧 English:

I study hard. Furthermore, I practice daily

📝 Translation:

I study hard. Furthermore, I practice daily

🇪🇸 Spanish:

Es caro. Sin embargo, vale la pena

🇬🇧 English:

It's expensive. However, it's worth it

📝 Translation:

It's expensive. However, it's worth it

🇪🇸 Spanish:

Debido a la lluvia, nos quedamos en casa

🇬🇧 English:

Due to the rain, we stayed home

📝 Translation:

Due to the rain, we stayed home

⚠️
Punctuation: Advanced connectors usually go at the start of the sentence, followed by a comma.

Common Mistakes

❌
Error: "I like coffee, I like tea" ❌
Correct: "I like coffee and tea" or "I like coffee, and I like tea" ✅
You need a connector to join sentences
❌
Error: "Because I'm tired, so I'll sleep" ❌
Correct: "Because I'm tired, I'll sleep" or "I'm tired, so I'll sleep" ✅
Do not use 'because' and 'so' together
❌
Error: "I study hard, but I don't pass" ❌
Correct: "I study hard, but I don't pass" ✅
This sentence is fine, but make sure the ideas contrast
❌
Error: "If I have time, I will go" (no comma) ❌
Correct: "If I have time, I will go" ✅
Use a comma when the subordinate clause comes first

Important Rules

1. Punctuation with connectors

Use a comma before coordinating connectors when joining complete sentences.

Examples:
  • I like coffee, and I like tea
  • I'm tired, so I'll sleep

2. Subordinate clauses

If the subordinate clause comes first, use a comma after it.

Examples:
  • When I'm tired, I sleep
  • Because it's raining, I stay home

3. Avoid repetition

Do not use redundant connectors.

Examples:
  • Because I'm tired, so I'll sleep ❌
  • I'm tired, so I'll sleep ✅
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