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  ENGLISH GRAMMAR  
Alphabet
Vowels & Consonants
Word Building
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Articles
Cardinal-Ordinal Numbers
Noun
Pronoun
Verb
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Tenses
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Active & Passive Voice
Direct & Indirect Speech
Vocabulary
VERB
Types of Verbs Infinitive Verbs Auxiliary Verbs
Can Be Been Being May Will Shall Should Might Could
Would Must Never Dare Need Keep Kept Used to Ought to Going to
Question Tags Yes/No Questions Regular Verbs Irregular Verbs
AUXILIARY VERB - "COULD"
Uses of - COULD
 
Could is not a past form of Can, but a past equivalent of can. It is used for the action in the past to express possibility/ability of action.
 
Examples
The letter could have been written in the morning.  
  It is used in :  
Simple present tense /past tense could
Simple present continuous tense could be
Simple future tense could
Future continuous tense could be
Examples : Possibility
Extreme rain could cause the river to flood the city.  
John could be the one who stole the money.  
Examples : Past ability
Simran could ski like a pro by the age of 11.  
I could run ten miles in my twenties.  
I could speak Chinese when I was a kid.  
Examples : Suggestion
You could see a movie or go out to dinner.  
You could spend your vacation in Singapore.  
Examples : Request
Could I use your computer to email my boss?  
Could I have something to drink?  
Could I borrow your News paper?  
Examples : Conditional
If I had more time, I could travel around the world.  
We could go on the trip if I didn't have to work this weekend.  
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Types of Verbs Infinitive Verbs Auxiliary Verbs
Can Be Been Being May Will Shall Should Might Could
Would Must Never Dare Need Keep Kept Used to Ought to Going to
Question Tags Yes/No Questions Regular Verbs Irregular Verbs