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Modal auxiliary verbs are a special type of auxiliary verb, used mainly to express ability, likelihood, permission, and obligation. These include 'will', 'would', 'can', 'could', 'shall', 'should', 'may', 'might', 'must', 'ought', 'need', and 'dare'. Please do not use this tag for the non-modal auxiliaries 'be', 'have', or 'do'.

10 votes
4 answers
3k views

Difference between "Should" vs "ought to"

It's essential that the documents (should)/(ought to) be destroyed immediately. Which one is more suitable one as I know "ought to" and "should" are synonyms.
Sanjar Igamov's user avatar
3 votes
1 answer
377 views

Can(could) vs to be able to

My grandfather could speak five languages  My grandfather was able to speak five languages. What is the exact difference, as I know can/ could are used for abilities.
Sanjar Igamov's user avatar