Lev Landau They have a doubtful look in their eyes. You need this one. 'have' is a non-progressive verb.
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Lev LandauThey have a doubtful look in their eyes.You need this one. 'have' is a non-progressive verb. That means it isn't used in the continuous tenses (is having, was having) unless it is part of an idiom that expresses an action. A doubtful look is not an action, so you should not use 'are having' in this case.