перевидите в вопрасительную и отритцательную форму предложения !
1) Its a fishmongers
2) A Fishmonger is standing behind the counter.
3) He is selling fresh fish , frozen fish , smoked fish and tinned fish .
4) A customer is standing at the counter .
5) She has a string bag in her hand.

У вас ошибочки в вопросе: переведите в вопросительную и отрицательную ...

Is it a fishmonger? It isn't a fishmonger. Is a fishmonger standing ...? A fishmonger isn't standing... Is he selling...? He isn't selling... Is a customer standing ...? A customer isn't standing... Has she ...? She hasn't ...