Błędy gramatyczne

Chciałabym poprosić o sprawdzenie tego tekstu, w którym miejscu są błędy gramatyczne:

The teacher shouldn’t give students list of vocabulary or the transcribed text before listening. If they don’t understand many words from the recording, it means the task is too difficult for their language level. Of course there are some key words important to ‘catch’ the meaning and useful for further tasks, but it shouldn’t be many.
Then students listen the recording for the second time. If some of them still haven’t got it after the second listening, the teacher can play important parts again and allows them to add , modify, or verify the information they presented after the first listen. If still something is unclear the teacher should allow students to do multiple listens. And then can start with comprehension questions.
If anyone has answered all of the questions without listening again it was probably too easy (or those students are in the wrong class) .When teacher plays the recording again, can also pause it after the first question is answered to check if everyone is keeping up."

The teacher shouldn’t give students (tutaj brakuje przedimka) list of vocabulary or the transcribed text before listening. If they don’t understand many words from the recording, it means THAT the task is too difficult for their language level. Of course there are some 'key words important' (zla kolejnosc slow) to ‘catch’ the meaning and useful for further tasks, but 'it' (to ma sie zgadzac z 'words' - l. mnoga) shouldn’t be many.
Then students listen (tu cos brak) the recording for the second time. If some of them still haven’t got it after the second listening, the teacher can play important parts again and 'allows' (to odnosi sie do 'them' l. mnogiej) them to add , modify, or verify the information 'they' (tutaj nie jest jasno czy to 'teacher' czy 'students') presented after the first 'listen' (cos tu nie tak). If 'still something is' (zla kolej slow...) unclear the teacher should allow students to do multiple 'listens' (zle slowo). 'And' (nie zaczynaj zdan z 'and') then (ale kto? co? musisz napisac) can start with (ja dalabym tutaj przedimek) comprehension questions.
If anyone has answered all of the questions without listening again 'it' (trzeba wyjasnic do czego to 'it' sie odnosi) was probably too easy (or those students are in the wrong class) .When (przedimek) teacher plays the recording again, (kto? co?) can also pause it after the first question is answered to check if everyone is keeping up."