I can cling you can cling he can cling we can cling you can cling they can cling
V-ing form
I can be clinging you can be clinging he can be clinging we can be clinging you can be clinging they can be clinging
Perfect
I can have clung you can have clung he can have clung we can have clung you can have clung they can have clung
V-ing perfect
I can have been clinging you can have been clinging he can have been clinging we can have been clinging you can have been clinging they can have been clinging
Negation
Simple form
I can't cling you can't cling he can't cling we can't cling you can't cling they can't cling
V-ing form
I can't be clinging you can't be clinging he can't be clinging we can't be clinging you can't be clinging they can't be clinging
Perfect
I can't have clung you can't have clung he can't have clung we can't have clung you can't have clung they can't have clung
V-ing perfect
I can't have been clinging you can't have been clinging he can't have been clinging we can't have been clinging you can't have been clinging they can't have been clinging
Interrogative form
Simple form
can I cling? can you cling? can he cling? can we cling? can you cling? can they cling?
V-ing form
can I be clinging? can you be clinging? can he be clinging? can we be clinging? can you be clinging? can they be clinging?
Perfect
can I have clung? can you have clung? can he have clung? can we have clung? can you have clung? can they have clung?
V-ing perfect
can I have been clinging? can you have been clinging? can he have been clinging? can we have been clinging? can you have been clinging? can they have been clinging?
Interro-negative form
Simple form
can't I cling? can't you cling? can't he cling? can't we cling? can't you cling? can't they cling?
V-ing form
can't I be clinging? can't you be clinging? can't he be clinging? can't we be clinging? can't you be clinging? can't they be clinging?
Perfect
can't I have clung? can't you have clung? can't he have clung? can't we have clung? can't you have clung? can't they have clung?
V-ing perfect
can't I have been clinging? can't you have been clinging? can't he have been clinging? can't we have been clinging? can't you have been clinging? can't they have been clinging?