if he study hard,he will ( ）learn English well.里面应该填什么?选项有：be able to,is able to,can,able to,为什么?

And he must study hard He doesn't study hard If he works hard he will study English_____will变一个字母 If he isn't careful.If he doesn't study hard.两句分别改同意句. He is always ___(study)hard. he always _____(study) English very hard. He _______(study)hard every day stop talking .he is (hard) to study He didn't study hard ,so he f(). If you keep_____(study) hard,you'll catch up with othersCould you wait here until he _____(reach) home? if he study hard,he will ( ）learn English well.里面应该填什么?选项有：be able to,is able to,can,able to,为什么? He studies English hard 一般将来时 He is ____ _____ study English hard. He must_(try)his best to study hard at English He ____ very hard in the ____(study). He study very hard这句话是对是错 He decided to study hard this term.同义句子 he doesn't study hard.改肯定句 He doesn't study hard改为附加疑问句