时态一致
1）并列谓语的时态一致。
【例如】Yesterday I went shopping, bought some books and had dinner at a good restaurant.
The soldier looked at him, exchanged glances with his comrade and took out the gun.
2）主从复合句的时态一致。
a）主句为现在时、将来时、现在完成时，宾语从句谓语动词时态按情况而定。
【例如】
I wonder what will happen tomorrow.
I wonder what happened to him yesterday.
I wonder what is happening now outside.
b）主句为过去时态，宾语从句一般用过去时态。如果宾语从句说明的是客观真理，用一般现在时。
【例如】
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