[正] They must have arrived by now.?
[析] by now是用于表达到目前为止某一动作已经发生,所以应用瞬间动词。而till now是强调某一动作一直持续到现在,所以一定要用持续性动词。?must have+过去分词是对过去某一事情所作的肯定推测。?
[误] Someone called you right now.?
[正] Someone called you just now.?
[析] just now有两个意思,其一是刚才,其二是现在,而right now只能用于现在的状态。just则用于完成时态,如: I have just finished my homework.?
[误] My father will be back from America at present.?
[正] My father will be back from America presently.?
[析] presently有两个意思:其一是最近,不久,其二在美语中是现在之意,与at present相同。而for the present为暂时,如: I teach English in the school for the present.
[误] I'll be back at the moment.?
[正] I'll be back in a moment.?
[析] at the moment 其意为现在,当时,而in a moment意为马上过一会,与in a minute意思相近。?
[误] The train from Shanghai will arrive here in time.?
[正] The train from Shanghai will arrive here on time.?
[析] on time为准时,而in time有两个含意。其一是及时,如:The doctor arrived in time。其二是将来,终究。?
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