首先,要说明的是,并不是每个句子都适合于变成各种时态.

　　一般现在时态：

　　JackisfromAmerica.【最好不变化】

　　Heworkshardathislessons.

　　Helikeplayingfootball.

　　HecanspeakbothEnglishandChinese.

　　Heenjoyssingingbeautifulsongs.

　　对应现在进行时态：

　　Heisworkinghardathislessons.

　　Heisplayingfootballnow.

　　HeisspeakingtoothersaroundhimwithEnglishandChinese.

　　Heisenjoyingsingingthebeautifulsongs.

　　过去进行时态：

　　Hewasworkinghardathislessons.

　　Hewasplayingfootballatsixlastafternoon.

　　HewasspeakingtoothersaroundhimwithEnglishandChineseattenyesterdaymorning

　　Hewasenjoyingsingingthebeautifulsongsatelevenlastnight.

　　一般过去时态：

　　Heworkedhardathislessons.

　　Helikedplayingfootball.

　　HecouldspeakbothEnglishandChinese.

　　Heenjoyedsingingbeautifulsongs.

　　一般将来时：

　　Hewillworkhardathislessonsthisterm.

　　Heshallplayfootballtomorrowmorning.

　　HewilllearntospeakbothEnglishandChinese.

　　Hewillsingbeautifulsongsatthepartythisevening.

　　现在完成时：

　　Hehasworkedhardathislessonssincethestartofthisterm.

　　Hehasbeeninterestedinplayingfootball.

　　HehaslearnedtospeakbothEnglishandChinese.

　　Hehasbeenfondofsingingbeautifulsongs.

　　过去完成时：

　　Hehaddecidedtoworkhardathislessonssincethatexam..

　　Hehadbeeninterestedinplayingfootballbeforehewasfifty.

　　HehadlearnedtospeakbothEnglishandChinesebeforehecametoChina.

　　Hehadenjoyedsingingbeautifulsongsbeforeheattendedtheparty.