1) since +过去一个时间点 。
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
2016届高考英语基础词汇解读:必修2module1ourbodyandhealthyhabits
2016届高考英语冲刺综合训练解析13
2016届高考英语基础词汇解读:必修5module3adventureinliteratureandthecinema
2016届高考英语基础词汇解读:必修4module1lifeinthefuture
2016届高考英语冲刺综合训练解析5
2016届高考英语基础词汇解读:必修3module1europe
2016届高考英语基础词汇解读:必修4module5atripalongthethreegorges
2016届高考英语基础词汇解读:必修1module4asocialsurvey
2016届高考英语冲刺综合训练解析23
2016届高考英语基础词汇解读:必修3module6unexplainedmysteriesofthenatureworld
2016届高考英语冲刺综合训练解析25
2016届高考英语冲刺综合训练解析16
2016届高考英语基础词汇解读:必修3module3theviolenceofnature
2016届高考英语冲刺综合训练解析15
2016届高考英语基础词汇解读:必修4module3bodylanguageandnon-verbalcommunication
2016届高考英语冲刺综合训练解析21
2016届高考英语冲刺综合训练解析22
2016届高考英语冲刺综合训练解析10
2016届高考英语基础词汇解读:必修5module2ajobworthdoing
2016届高考英语基础词汇解读:必修4module4greatscientists
2016届高考英语基础词汇解读:必修2module6filmsandtvprogrammes
2016届高考英语冲刺综合训练解析26
2016届高考英语基础词汇解读:必修2module4finearts—western,chineseandpoparts
2016届高考英语基础词汇解读:必修5module4carnival
2016届高考英语冲刺综合训练解析20
2016届高考英语冲刺综合训练解析18
2016届高考英语基础词汇解读:必修3module2developinganddevelopedcountries
2016届高考英语基础词汇解读:必修5module1britishandamericanenglish
2016届高考英语基础词汇解读:必修1module5alessoninalab
2016届高考英语冲刺综合训练解析8
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