grammar都係pattern,英文唔複雜,我見比較多人有語病既地方都係完成式點用同埋preposition用錯。
Tenses既話你可以試下將你平時會講會寫既句式大致列晒出黎,敍事、假設、問句等等其實數埋都唔係咁多種,每個種類又有常用句型,你每種句型多練造句就係,睇戲𠴱時又可以試下少少分析將角色對白睇下佢係用邊種句型。
例如:
I would've told her if I knew.
Had I known I wouldn't have believed her.
呢啲都係假設語氣既講法唔同情況會講既唔同句型。聽得多用得多就會熟。
又有啲特別少少可能教科書少教既就睇多啲劇就會pick up到。
例如口語好多時係會用現在式黎講故事,唔一定要用過去式,
例如:
So I am walking down the hall just minding my own business, and out of nowhere this crazy kid just starts screaming at the top of his lungs...
上面提到preposition用錯呢個都係要多留意多講,想背都得既,你google phrasal verbs應該有好多例可以俾你背。但係你唔多講多寫既話可能比較難commit to memory。上reddit搵個有興趣既subreddit多啲post下都應該練到少少既。不過呢個年代reddit同連登都冇乜grammar nazi會免費幫你改正英文

你可能會一直錯落去都唔知。
但係我未學過點樣有系統教人真係唔知可以推薦啲乜野練習方法。