时态语法

动词的各种变形

动词的各种形态	变形	是否可做谓语
原型	do	可以
三单	does	可以
过去式	did	可以
现在分词	doing	不可以
过去分词	done	不可以
不定式	to do	不可以

时态语法

	一般	进行时	完成时	完成进行时
	做	正在做	已经做完	一直做
现在	do/does	am/is/are doing	have/has done	have/has been doing
过去	did	was/were doing	had done
将来	will do	will be doing	will have done
过去将来	would do	would be doing	would have done