We use “able” especially in the structure be able + infinitive. This often has the same meaning as can. There is a negative form...

1 punctuation We usually write abbreviations without full stops in modem British English. Full stops (AmE ‘periods’) are normal in American...

Comma after so When so is used to mean therefore, it is a transitional adverb. So, it should be followed by a comma. I was not feeling well. So, I...

non-progressive verbsSome verbs are not used in progressive forms (see progressive 2: non-progressive verbs), even if the meaning is one for which...