When do we use 'seem to be V-ing'? - Quora

因為seem 是一個不能加ing的動詞啊，不能寫is seeming 的啊． 那第四句又是什麼鬼啊？ ... (seem to + be ving 進行式). 他似乎正在想什麼事情．

There seem(s) to be 或there seemed to be + 名詞(片語) － 注意：Seem ... Seem 意為「似乎，好像，看起來」，僅能當連綴動詞用，其後接形容詞...

We can use it as a linking verb (like be) or with a to-infinitive. We do not normally use seem in...