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when they saw the accident.
by the time I visited them.
drive
are driving
have driven
will drive
drove
were driving
had driven
Simple present tense
(一般现在时)
Present continuous tense
(现在进行时)
Present perfect tense
(现在完成时)
Simple future tense
(一般将来时)
Simple past tense
(一般过去时)
Past continuous tense
(过去进行时)
Past perfect tense
(过去完成时)
Simple present tense
常用时间状语 ：
do/does；am/is/are
often, usually, always, sometimes, never , every week…
注：如果陈述句子为客观真理，我们也应该用一般现在时。如：
The moon goes around the sun.
Present continuous tense