The verbs of perception are always expressed with the modal verb 'can':
Can you see me?
You can hear the sea.
Can / Could 1 (Liveworksheets)
Can / Could 2 (Grammarbank)
Can / Could / Be able to (Liveworksheets)
Could and Was/Were able to (Liveworksheets)
Can, Could, Be able to 1 (Wordwall)
Can, Could, Be able to Speaking (Wordwall)
Must 1 (Englischhilfen): activity 1
Must 2 (Liveworksheets): activity 2
Must 3 (Liveworksheets): activity 3
Must / Have to (Grammarbank): activity 4
Traffic Signs + must/can (Liveworksheets): activity 5
Traffic Signs + must/can 2 (Liveworksheets): activity 6
The school uniform, speaking + grammar (Liveworksheets): activity 7
Classroom rules, speaking + grammar (Liveworksheets): activity 8
May / Might 1 (British Council): activity 1
May / Might 2 (Tolearnenglish): activity 2
May / Might 3 (Usingenglish): activity 3
Should 1 (Oxford): activity 1
Should 2 (Focus): activity 2
Should 3 (ESL Lounge): activity 3
Healthy habits, speaking + grammar (Liveworksheets): activity 4
The environment, listening (Liveworksheets): activity 5
Should have 1 (Liveworksheets): activity 6
The deadline, reading (Photocopiables): activity 1
School rules (Liveworksheets): activity 2
Can/Could:
The Leftorium (Teach This)
Can you? (Teach This)
Must:
Must/Mustn't (British Council)
May/Might:
Should: