7.2 Tense

有两种分类方法：

1. 传统：16种时态
2. 新式：时（Tense） 和 体（Aspect）

• An Introduction to Verb Tenses

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Simple	Present	I drive home every day	simple present verb
	Past	I drove home yesterday	Simple past verb
	Future	I will drive home later	will/be going to + simple present
Progressive	Present	I am driving now.	am/is/are were + -ing verb
	Past	I was driving when you called	was/were + -ing verb
	Future	I will be driving when you call	will be + -ing verb
Perfect	Present	I have driven that road	have/has + past participle verb
	Past	I had already driven that road in the past	had + past participle verb
	Future	I will have driven 200 miles by tomorrow	will have + past participle verb
Perfect Progressive	Present	I have been driving since this morning	had been + -ing verb + for/since
	Past	I had been driving for three hours before I stopped to get gas	have/has + -ing verb + for/since
	Future	I will have been driving for five hours by the time I arrive.	will have been + -ing verb + for/since

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