高一英语翻译句子,急啊!

高一英语翻译句子,急啊!
1.英语老师的帮助对她的英语学习起了很大的作用.
The English teacher's help ___________ ____________her English learing.
2.要想保持苗条,我建议你改变一下饮食.
I suggest you _____________________ your dietif you want to keep slim
3.他学习成绩不好,不是因为他傻,而是因为他不专心.
He gets poor gardes ______ beacuse he is stupid ______ beacuse he does't concentrate on his studies.