ahead的英文解释

ahead 一般表示强调 整体部位的向前 表示一个空间感觉forward 强调的是时间性 和 给出例句中的 向前冲的感念而 along 表示独自在前面 表示独自的状态例第一句 可以用ahead 也可以用along 强调的内容不同ahead 强调在队伍整体的前部 而along表示she 是单独在队伍的前面 强调单独希望解释清楚了给出例句中 依据内容强调的不同 可以调换 有的不能调换

1>She bicycled along,singing loudly . (动作方向的'向前') It also makes sense if you say, it bicycled ahead...however this sounds odd so it is wise to stick to along'.2>The soldiers crept forward under cover of darkness.(动作的方向性), forward- can be also replaced by 'ahead'....along would still retain the meaning but again..it'll sound odd..3> from this time forward (时间的方向性), for this phrase, if you replace 'forward' with 'ahead' and 'along' then it would be wrong. REMEMBER....from this time FORWARD...just remember this..it's a phrase.4>The year crept along unnoticed.(时间的方向), ahead would also make sense but it would sound odd....so keep along in this sentence.5>The line of cars moved ahead slowly.(动作的‘向前’） along could be used with 'ahead'6>Full speed ahead. this is again sort of a phrase..so just remember that ahead is commonly used in directions.7>Police have appealed for witnesses to come forward. 警方呼吁目击者挺身而出。 in this case, along and ahead would be wrong..forward wouls grasp the meaning...8>The policeman told the crowds to move along. 警察叫人群向前走动. again....along is better than the other twothe 3 all mean the samething but you time to fully understand when and how to use it...however, most people would understand what you mean anyways..