PERFECT TENSE

Present Perfect Tense
Present perfect tense is used for describing a past action's effect on the present.
The Pattern :
1. Affirmative Form
S + have/has + V3
Example :
I have arrived
2. Negative Form
S + have/has + V3
Example :
I have not arrived
4. Interrogative Form
Have/has + S + V3 + ?
Example :
Has she arrived ?

Future Perfect Tense
Future perfect tense is used to describe something that will happen in the future

The Pattern :
1. Affirmative Form
S + will + have + V3
Example :
I will have swum at 11 tomorrow
2. Negative Form
S + will + not + have + V3
Example :
I will not have swum at 11 tomorrow
3. Interrogative Form
Will + S + have + V3 + ?
Will you have swum at 11 tomorrow

Past Perfect Tense
Past perfect tense is used to describe something that have done in the past

The Pattern :
1. Affirmative Form
S + had + V3
Example :
I had gone to Bali
2. Negative Form
S + had + not + V3
Example :
I hadn't gone to Bali
3. Interrogative Form
Had + S + V3 + ?
Had you gone to Bali ?