Sequence of tense of adverb clauses of time

SEQUENCE OF TENSE OF ADVERD CLAUSES OF TIME
(Sự phối hợp thì của mệnh đề trạng ngữ chỉ thời gian)

*Nhận biết: được dẫn đầu bằng những liên từ: AS SOON AS, AS, WHILE, WHEN, TILL, UNTIL, AFTER, BEFORE, SINCE...
*NOTE: Không dùng thì tương lai trong mệnh đề trạng ngữ chỉ thời gian.

Main clause:
SIMPLE PRESENT
=>Adv of time:
- SIMPLE PRESENT
- PRESENT PROGRESSIVE
-PRESENT PERFECT
Ex:
1.The secrectary always goes home as soon as her boss leaves the ofice.
2.I often read a newspaper while I'm waiting for a bus.
3.He never goes home before he has finished his work.

Main clause:
SIMPLE PAST
=>Adv of time:
- SIMPLE PAST
- PAST PROGRESSIVE
- PAST PERFECT
Ex:
1.All students stopped laughing when the teacher came in.
2.I saw him when he was talking to a girl.
3.Yesterday, I went to the post office after I had written a letter.

Main clause:
SIMPLE FUTURE
=>Adv of time
- SIMPLE PRESENT
- PRESENT PROGRESSIVE
- PRESENT PERFECT
Ex:
1.I'll give him some helps when i see him tomorrow.
2.I'll think it over while I am having lunch.
3.I'll wait for you until you have finished your meal.

Main clause:
PRESENT PERFECT
=>Adv of time:
- SIMPLE PAST
- PRESENT PERFECT
- PRESENT PERFECT PROGRESSIVE
Ex:
1.He has played football since he was 10 years old.
2.I have learned a lot since I have lived here.
3.He has busied a lot since he has been attending this course.
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