Tenses tenses denote the time of action. They show when the work is done. They are: (1) Present Tense (2) Past Tense (3) Future Tense They are further divided into: (1) Simple Present

Subject + had + not been + V1+ ing + Object + (.) 
She had not been writing a letter. 
3.
Interrogative Sentences- 
Had + Subject+ been+ V1 + ing + Object + (?) 
Had she been writing a letter? 
4.
Interrogative Negative Sentences- 
Had + Subject +not + been + V1 + ing + Object + (?) 
Had she not been writing a letter? 
 
 

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FUTURE TENSE 
Time and tide wait for no man. So, a period of time following the moment of 
speaking or writing is called as future tense. 
For e.g- She will write a letter. 
Simple Future 
This tense tells us about an action which has not occurred yet and will occur after 
saying or in future 
Rule – 
Will/Shall + Verb (Ist form) 
In Future Tense helping verb ‘Shall’ is used with ‘I’ and ‘We’. Helping verb ‘Will’ 
is used with all others. When you are to make a commitment or warn someone or 
emphasize something, use of 'will/shall' is reversed. ‘Will’ is used with ‘I’ & ‘We’ 
and 'shall' is used with others. 
Tense
Past (before 
now)
Present (now)
Future (After 
now)
Simple Future
Future 
Continuous
Future Perfect
Future Perfect 
Continuous

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In general speaking there is hardly any difference between 'shall & will' and 
normally ‘Will’ is used with all.
Now, let us use this rule in various forms of sentences; 
1.
Positive / Affirmative Sentences –
Subject + Will/Shall + Verb (Ist form) + Object + (.) 
She will write a letter. 
2.
Negative Sentences- 
Subject + Will/Shall + Not + Verb (Ist form) + Object + (.) 
She will not write a letter. 
3.
Interrogative Sentences-