Organic Name Reactions for the students and aspirants of Chemistry12th.pptx
Tenses
1.
2. Present Tense
Simple Present
Eg: The sun rises in the east
Present continuous
Eg: I am writing a letter
Present Perfect
Eg: He has seen that film.
Perfect Continuous
He has been working in the office since 1994.
3. Past Tense
Simple Past
My grandfather died last year.
Perfect Continuous
He was talking all the morning
Past perfect
The train had left by the time I reached the station.
Perfect continuous
I had been reading for hours before he came.
4. Future Tense
Simple Future
We shall meet before Christmas.
Future Continuous
They will be taking rest after the day’s labour.
Future Perfect
He will have left his office before you reach there.
Future Perfect Continuous
By next March I shall have been working in the office
for seven years.