Is there anything more to this problem? maybe a picture ?
If the starting tense is future and in the ellos form and its a regular verb the answer would be comprarían.
Answer:
#1 is: su aconsejable para bañarse....which means....It is advisable to bathe.
#2 is. Hay que Utilice la loción del bronceado del sol....which means....You have to use sun tan lotion.
#3 is. no es bueno para secar el cabello....which is....its not good to blow dry your hair.
#4 is. no es bueno si tu cabello se cae....which is....its not good if your hair falls out.
