连系动词look有时可以用于进行时态。《牛津英语用法指南》第三版第331.1节指出：谈论暂时的外观，可以用一般式或进行式；意义上无太大区别。如：
You look / You're looking very unhappy. What's the matter ? 你一脸不高兴。怎么回事？
《牛津英语用法指南》同时还指出：look 后面可以跟 like 或 as if （参见74），在这种情况下，一般不用进行式 。如：
She looks like her mother. 她长得像她母亲。
It looks as if it's going to rain. 看样子要下雨。（不能说：It's looking as if ... ）
She looks as if she's dreaming. 她好像在做梦。
She looks like she's dreaming . 她好像在做梦。 （非正式）（不能说：She's looking like...）