八大时态：一般现在时、一般过去时、现在进行时、过去进行时、现在完成时、过去完成时、一般将来时、过去将来时。一般现在时： It seldom snows here。一般过去时：含有Be动词主语+was/were+......，I didn't know you were so busy等。

现在进行时：I am flying Beijing next week。过去进行时：was/were+doing。一般将来时：am/is/are+ going to + do；will/shall + do。过去将来时：was/were + going to + do；would/should + do。I asked who was going there。