引導(dǎo)時(shí)間狀語從句的從屬連詞
1、表示“當(dāng)…時(shí)候”或“每當(dāng)”的時(shí)間連詞。主要的 when, while, as, whenever。如：
Don’t talk while you’re eating. 吃飯時(shí)不要說話。
Vegetables are best when they are fresh. 蔬菜新鮮時(shí)最好吃。
He came just as I was leaving. 我正要走時(shí)他來了。
2、 表示“在…之前(或之后)”的時(shí)間連詞。主要的有before, after。如：
Try to finish your work before you leave. 離開前設(shè)法把工作做完。
After we have finished tea, we will sit on the grass. 喝完茶之后我們將坐在草地上。
3、表示“自從”或“直到”的時(shí)間連詞。主要的有since, until, till。如：
She’s been playing tennis since she was eight. 她從八歲起就打網(wǎng)球了。
Hold on until I fetch help. 堅(jiān)持一下，等我找人來幫忙。
Never trouble trouble till trouble troubles you. (諺)不要無事惹事。
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