onlythen后面要用一般过去时吗?
不一定的。理由如下 :-
1. then 是副词, 解作为 : at that time in the past, [ 过去时 ]
e.g. Mary was in the bus station then.
2. 亦可解作为 :at that time in the future, [ 將来时 ]
e.g. As she will be there on Tuesday, I'll meet her then.
3. 也亦可解作为 : next/afterwards, [ 之后也 ]
e.g. Mary had supper and then went to bed.
4. 解作 : therefore, [ 因此 ]
e.g. Henry is hungry. Then he must have some food.
要看完整的句子和情形而定
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