till和until同義，作“直到……時（為止）”解，till多用於非正式文體，until多用於句首。如：A woman is like a tea bag you never know how strong she is until she gets in hot water.（Eleanor Roovelt）
Until you’ve lost your reputation，you never realize what a burden it was.（Margaret Mitchell）
Everything is vague to a degree you do not realize till you have tried to make it preci.（Bertrand Rusll）
9.wheneverbreabsp;timebrevery time引導的時間狀語從句
whenever在引導時間狀語從句時作“每當；每次”解，eabsp;time和every time與whenever同義，通常可以與它換用。如：Whenever you find that you are on the side of the majority，it is time to reform.（Mark Twain）
Every time you suppress some part of yourlf or allow others to play you small，you are in esnbsp;ign the owner’s manual your creator gave you and destroying your design.（Oprah Winfrey）
地點狀語從句
1.where引導的地點狀語從句
（1）where可以引導地點狀語從句，表示“在……的地方”。如：Where there is love there is life.（Mahatma Gandhi）Where there is great love，there are always wishes.（Willa Cather）
（2）where 在地點狀語從句中，除指地點外，還可指處境等。如：Love builds bridges where there are none.（R.H.Delaney）
2.wherever引導的地點狀語從句
從屬連詞wherever“在（或到）……的各個地方”。如：Every man，wherever he goes，is enpasd by a cloud of f vis，whibsp;move with him like flies on a summer day.（Bertrand Rusll）
原因狀語從句
1.becau引導的原因狀語從句
becau表示人們不知道的直接的原因或理由，著重點在從句，其所引導的從句為全句句意的中心所在。通常用於回答why引出的疑問句，語氣最強，除特別強調外，該從句一般位於主句後麵。如：We don’t bother mubsp;about dress and manners in England，bebsp;as a nation we don’t dress well and we’ve no manners.（Gee Bernard Shaw）
Fathers nd their sons to college either bebsp;they went to college or bebsp;they didn’t.（L.L.Henderson）
2.as引導的原因狀語從句
as引導的原因狀語從句所傳遞的通常是已知信息，從句多位於主句之前，通常可以和since換用。如：As I know more of mankind，I expebsp;less of them，and am ready now to call a man a good man upon easier terms than I was formerly.（Samuel Johnson）
3.since引導的原因狀語從句
since引導的原因狀語從句所傳遞的通常是已知信息，從句多位於主句之前，通常可以和as換用。如：Money frees you from doing things you dislike.Sinbsp;I dislike doing nearly everything，money is handy.（Groubsp;Marx ）
Sinbsp;a politi never believes what he says，he is quite surprid to be taken at his word.（Charles De Gaulle）