i have done all the questions but i dont know if they are right lol
with #5 the monther was not lieing to the daughter, she said that if she doesnt eat her dinner then she cant stay up late to watch tv. the mother never said that the daughter can stay up late if she eats her dinner..
with #6 i found it pretty hard but i attempted it and i dont really know
and for #7 just basically refer to the truth tables you can get in the lecture notes and make columns for all of the letters
hope i helped