One usage of the past perfect tense shows that something started in the past and continued up until another action in the past.

The past is past. Let us look ___ . A: ahead B: down C: in D: for

In present the following description may be the best explanation of time: Time is the sequence of the irreversible events, time goes in a completely determined order. The arrow of time points to the future from the past. The future can become the past but the past can never become the future.

听对话选出所有正确的答案。 A: They can find the size of the family in the past. B: They can get clues to our past from old family pictures. C: They are only interested in important events and people. D: They can recognize the fashionable style in clothes in the past.

Psychologically there are two dangers to be guarded against in old age. One of these is too great an absorption in the past. A: It is dangerous for old people not to face the harsh reality. B: It is dangerous for old people to look back on their past glories. C: One of the dangers is being interested in the present, not in the past. D: One of the dangers is living in memories, in regrets for the good old days.

It was very _______in the past.

Decisionsmight affect the past.

Now it is different from the past.

The humanities play a dominant role in the past.

Michael Dell washed dishes in the past.