how to remember many vocabularies ? im in trouble of remember any vocabulary...in the first day i may remembered it in my mind,but it doesn't work in second day...can anyone give me a advise ?

which are important grammar,listening,or practice ? im so confused,if i want to talk with someone.i should remind how to speak very well with grammar..is grammar important?tt i difficult to listen my lesson while i was taking english course and then im often shy speaking english..i am not confident please give me a advice

please which correct the errors 1. if will be cold tomorrow morning,my car won't start 2. fatima will call us tonight whe she will arrive home safely 3. when i'll see you tomorrow, i'll return your book to you 4.ahmed puts his books on his desk when he walked into his apartment 5. i'll see my parents when i will return home for a visit next July

how to use may and may be ? can everyone help me?