I have study English for three years?是什么时态

I have study English for three years?是什么时态 I have a hard time _____ English now.填study还是to study? I am not good at English I have to study hard to i-------- it why du I study English I often study English by_____ I want to study English I want to study English How can I study English? HOW could I study english How can i study English? i hard to study english I am serious ( )study English How do I study English i‘m sorry i have to____for the english testA.study B,studies C.studying I have c___in improving my English.i will study much harder I have started to study English since two years ago 怎么改 以 Why du I have tu study English 写一篇短文 I have to study Chinese,math English,seience and history at school翻译