| 单词 |
when(when, while, as) |
| 例句 |
when, while, as
这些连词均可表示“当……时”引出时间从句。
when → 所引导的从句，其谓语动词既可是持续动词，也可是短暂动词；谓语动词动作发生的时间可以与主句谓语动词的动作是同时，或之前、之后。
while → 句中的谓语动词应为持续动词，不用短暂动词，谓语动作发生的时间通常与主句谓语动词动作发生时间是同时。
as → 侧重指从句与主句的动作同时进行，谓语动词可以是持续性的，可以是短暂性动词。
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| 随便看 |
- foul(dirty, foul, nasty)
- foundation(base, basis, foundation, ground)
- found(build, construct, found, erect, establish, set up)
- fraction(part, piece, section, division, portion, fraction, fragment, segment, share)
- fracture(break, burst, crack, crush, fracture, shatter, smash)
- fragile(brittle, fragile, frail)
- fragile(weak, feeble, frail, fragile)
- fragment(bit, piece, sheet, slice, fragment, scrap)
- fragment(part, piece, section, division, portion, fraction, fragment, segment, share)
- frail(brittle, fragile, frail)
- frail(weak, feeble, frail, fragile)
- fraud(deceit, deception, fraud)
- freezing(cold, cool, chilly, frosty, freezing, icy)
- frequently(always, often, usually, frequently, repeatedly, regularly)
- fresh(new, fresh, novel, original, innovative)
- fret(worry, brood, care, fret)
- fright(alarm, fear, fright, horror, panic, terror, dread)
- frighten(alarm, frighten, startle, terrify, scare, intimidate)
- frightened(afraid, frightened, fearful, awful, dreadful, frightful, terrible, horrible, terrific, appalling)
- frightful(afraid, frightened, fearful, awful, dreadful, frightful, terrible, horrible, terrific, appalling)
- frontier(border, bounds, boundary, frontier, limit)
- frosty(cold, cool, chilly, frosty, freezing, icy)
- fulfil(perform, conduct, do, execute, fulfil)
- fulfil(satisfy, meet, fulfil)
- function(duty, obligation, responsibility, function)
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