Can I say,<br/><br/>(a) She is<u> good at public speaking.</u><br/><br/>(b) They wash hands <u>before (having) the meal.</u><br/><br/>(c) John l<u>ooked upset in front of his m</u>other.<br/><br/>(d) They<u> enjoyed at the picnic</u> yesterday. <br/><br/>(e) The girls are singing<u> in a choir. </u><br/><br/>(f) He felt sleepy <u>in class. </u>