do does doing did
swim swims swimming swam
have has having had
eat eats eating ate
study studies studying studied
就是这样的、最后一个和LS吧、不同、但是绝对是studied
do does doing did
swim swims swimming swam
have has having had
eat eats eating ate
study studies studying studied
就是这样的、最后一个和LS吧、不同、但是绝对是studied