Hello CICI AFRILIANTY.
i can recommend you some websites that i'm using sometimes to start your english step by step ^^
and this one for exercises 4-http://englishexercises.org/
this one is also good to watch some lessons from beginner to intermediate 5-https://www.engvid.com/ every instructor/teacher has a channel on youtube.
good luck ^^
The basic is verb ''To be'' verb. I think you should start to study its rules, and also
you could study the person and possesive pronouns.