4.89 USAGE NOTE

If you make a 'tag'-question out of a statement that contains a broad negative, the tag on the end of the statement is normally positive, as it is with other negatives. 'Tag'-questions are explained in paragraphs 10.122 to 10.130.

You can modify 'rarely' and 'seldom' by putting 'so', 'very', 'too', or 'pretty' in front of them. You can also modify 'rarely' by using 'only'.

If you want to say there is very little of something, you can use a broad negative with 'any' or with a word which begins with 'any-'.