“before+某时”只是单纯的指”在某时以前”;”by+某时”指”不迟于某时”The sun will ri before six o’clock.太阳会在六点之前出来.The sun will ri by six o’clock.太阳最迟在六点出来.
百度品牌推广to,till与until：1.和from的搭配:from…to;from…till;from…until：He teaches from midday to four o’clock.他从中午教书⼀直到四点.They are out together with their friends from morning till night.他们从早到晚和朋友⼀起在外⾯.It was cold from Christmas until April.从圣诞节直到四⽉份天⽓⼀直是冷的.
2.不和from的搭配They talked till dawn.他们交谈直到天亮.Wait until tomorrow.等到明天.
木加越念什么3.和not搭配:not until;not till:He didn’t return till ten o’clock.直到⼗点他才回来.He didn’t go until night.直到夜晚他才⾛.
since和from1.since⾃从…以来(包含有从过去某⼀时间开始⼀直延续到现在之意)常⽤于现在完成时.I haven’t been home since 1995.从⼀九九五年以来我都没有回过家.2. from从…(有：从…开始之意)I shall be in New York one week from today.从今天算起我要在纽约⼀个星期.from March to June 从三⽉份到六⽉份from morning till night从早到晚
宁波镇海区
from now on 从现在起 from then on 从那时起
during和for1.for达…(多长)时间We have been here for a week.我们在这⼉已有⼀周之久.2.during在…期简单做红烧肉
抓蚂蚱间
He swims every day during the summer.夏天期间他天天去游泳.during常和”the”连⽤.有时也可见for和”the”连⽤，但是在这种情况下for不是表⽰时间,⽽是表⽰⽬的;Are you stopping at this hotel for the night?你要在这个旅馆过夜吗?台风龙王
军事用语
如的四字词语in和during这两个单词有时好像可以互换.但是，实际上这两个介词HID_PREP分别表达不同的内含.No visitors called in your abnce.No visitors called during your abnce.你不在的时候没有⼈来访.in 侧重表达动作⽅⾯;during 侧重表达时间⽅⾯,”在这段时间,⽽不是在那段时间.”
