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外研版（2019）选择性必修四《Unit 1 Looking forwards》Period 2 Using languages优秀教学课件
Unit 1 Looking forwards
Period 2 Using language
Different tenses, different usages
have done
(现在完成时)
will be doing
(将来进行时)
would do
(过去将来时)
An action that started in the past and may still be going on or have just stopped.
An action or event taking place over a participate period in the future.
An intended future action or event as seen from the past.
had done
(过去完成时)
was/were doing
(过去进行时)
has/have been doing
(现在完成进行时)
An on-going situation at or around a particular time in the past.
An action that happened in a period of time up to the present.