Find the markers of the general present tense, the general past tense, the general future tense, the present continuous tense, the past continuous tense, the present perfect tense and the past perfect tense~

Find the markers of the general present tense, the general past tense, the general future tense, the present continuous tense, the past continuous tense, the present perfect tense and the past perfect tense~

Every day, every year, always, normally, often, sometimes, hardly, never, etc
Ago, yesterday, last year, last week, just now, the day before yesterday, in 1999, in the past
Tomorrow, next year, next week, the day after tomorrow, in the future
Now, look! Listen! It's 7 o'clock, we are doing
At this time of yesterday at that time at 7 o'clock last night
Over the years
By the end of last year
e.g. By the end of last term, we had learned 5000 new words.
2. By the time sb
e.g. The bus had already left by the time I got there.
3. Object clause
He said he had been to Beijing twice
He said he had been to Beijing twice
(because "say" is the past tense, and the action of going to Beijing takes place in the past,
So it's used up instead of used up now