in january还是on?还有My family usually clean(clean要不要加s,为什么)the

in january还是on?还有My family usually clean(clean要不要加s,为什么)the clean the windows为什么要加s I usually clean my room on the weekend. clean blackboard 和clean blackboard区别,为什么要加the, my father had me (clean)my bike,but i had it (clean)in the s ()I usually clean my house -- 30 minutes.A.on B.for C.in everyone in my family should do his part in the house clean i usually go hiking or clean my room on saturday. My mother is busy cleaning the room.中为什么clean要加ing? She need 20 minutes to clean the table 为什么要在minutes和clean之间加 They usually ____(clean)the house On saturdaus it's in january or february.my mother usually c____ the hous