I'm waiting for her since this morning. - wrong, I'm still waiting for her now. - correct, I've been waiting for her for four hours. - correct, We have been driving for about six hours. - correct, How long are Anne and Peter working here? - wrong, Amanda has been talking on the phone all day. - correct, I have been sitting in this office since 9 a.m. - correct, She's working here since 1998. - wrong, Are you study hard these days? - wrong,

Correct or not: present continuous / present perfect continuous questions

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