GRAMMAR求助He left his house,never to return.为什么是to return而不是returned?

GRAMMAR求助He left his house,never to return.为什么是to return而不是returned? 英语翻译His independence as a student,extending a pattern already manifest in grammar school,formed the initial chapter of an isolation within the university that continued until he left. He turned his c___ to the left. he hurt his left leg 反义疑问句 when he left,his mother ( )(cook). He dcided to take lots of grammar n______ to improve his English. He decided to take lots of grammar __to improve his English How long is it since he () his hometown?He () for nearly 10 years.A left;left Bhas left ;has leftChas left ;has been left Dleft ;has been left 一句英语翻译He left his hat and jacket behind He hurt his left leg,hurt怎么不是三单? he his with hand writes left 连词成句 He left his watch in the hotel .中文 He can with his left hand.改为否定 He left his car a mile back.中的back he left his hometown two years ago同意句 he has a cut on his left hand什么意思 when did you say he left his hometown?中文翻译是什么 He left —— （happy） during his holiday