首先,要說明的是,并不是每個(gè)句子都適合于變成各種時(shí)態(tài).
一般現(xiàn)在時(shí)態(tài)：
Jack is from America.【最好不變化】
He works hard at his lessons.
He like playing football.
He can speak both English and Chinese.
He enjoys singing beautiful songs.
對(duì)應(yīng)現(xiàn)在進(jìn)行時(shí)態(tài)：
He is working hard at his lessons.
He is playing football now.
He is speaking to others around him with English and Chinese.
He is enjoying singing the beautiful songs.
過去進(jìn)行時(shí)態(tài)：
He was working hard at his lessons.
He was playing football at six last afternoon .
He was speaking to others around him with English and Chinese at ten yesterday morning
He was enjoying singing the beautiful songs at eleven last night .
一般過去時(shí)態(tài)：
He worked hard at his lessons.
He liked playing football.
He could speak both English and Chinese.
He enjoyed singing beautiful songs.
一般將來時(shí)：
He will work hard at his lessons this term.
He shall play football tomorrow morning.
He will learn to speak both English and Chinese.
He will sing beautiful songs at the party this evening.
現(xiàn)在完成時(shí)：
He has worked hard at his lessons since the start of this term.
He has been interested in playing football .
He has learned to speak both English and Chinese.
He has been fond of singing beautiful songs.
過去完成時(shí)：
He had decided to work hard at his lessons since that exam..
He had been interested in playing football before he was fifty .
He had learned to speak both English and Chinese before he came to China.
He had enjoyed singing beautiful songs before he attended the party.