英语有16种时态,为(以buy为例):

一般时 进行时 完成时 完成进行时
现在 buy/buys be buying have/has had have/has been buying
过去 bought be buying had had had been buying
将来 will buy/be going to buy will be buying will have had will have been buying
过去将来 would buy would be buying would have had would have been buying

在下面的课程中,我们会一一作介绍。