Question

谁可以告诉我一些关于英语时态的问题?

Answer 1

现在时：也就是说某个动作经常发生。例：I
usually
go
to
school
on
foot.
但如果主语是第三人称单数，那么谓语动词一般要加s,也就是所谓的三单式。例：He
often
plays
basketball
with
his
friends.一般现在时的标志一般有usually和often
。
完成时：也就是说某个动作到目前为止已经发生了。例：I
have
studied
English
for
9
years.其标志有for+一段时间，since+过去时间。