I helped Tom buy 还是I helped Tom bought用合适的形式:I helped Tom ____(buy) a watch.那 did 后面的动词要改变原形吗?在过去式里有没什么句子前面动词要改变,后面动词也要改变?

I helped Tom buy 还是I helped Tom bought用合适的形式:I helped Tom ____(buy) a watch.那 did 后面的动词要改变原形吗?在过去式里有没什么句子前面动词要改变,后面动词也要改变? I helped Sally buy a new i helped Tom finsh his lessons对吗? I HELPED SALLY BUY A NEW WATCH是什么时态 I helped Sally ___(buy)a new watch. I helped Tom bought a new computer.改错 了 . Yesterday I helped Tom -------- his radio. 为什么--------要选mend I helped Sally buy a new watch对buy a new watch划线提问 I buy food in there 还是I buy food there 是Tom and I还是I and Tom? 英语基础语法问题.求教Today I helped my mother buy soy.为什么后面那个buy不用变成过去式? Tom is buying a skirt and i want to buy ( ),too.用one 还是用a one为什么 I helped my classmate today. 改写句子1、 I buy a book form Tom Tom---a book--- --- 是I take a computer 还是 I buy a computer? It was _____ who helped Tom out when he was in trouble.A.I B.me C.us D.ours Jim helped his mother (buy) a new watch last month.用buy还是to buy which one I should buy还是which one should I buy