情態動詞是系動詞嗎

情態動詞不是系動詞。系動詞可以單獨作謂語，如：She looks very beautiful.她看上去很美麗。情態動詞除need有時可作實意動詞而單獨做謂語外，必須同實意動詞一起作謂語。如：You must study hard.你一定要努力學習。

Would you mind opening the Windows.你介意打開窗户嗎��