8.66 contrast

If you simply want to contrast two statements, you use 'although', 'though', 'even though', or 'while'.

'Whilst' and 'whereas' can also be used. They are fairly formal words.

8.67

If you want to say that something which is probably true does not affect the truth of something else, you use 'even if'.

'Even if' is also used in conditional clauses. This use is explained in paragraph 8.39.

8.68

You use 'not that' instead of using 'although' and a negative. For example, instead of saying 'I have decided to leave, although no one will miss me', you can say 'I have decided to leave --- not that anyone will miss me'.

Clauses beginning with 'not that' always go after a main clause.