1
I have many books to read.
Sign 'I', 'HAVE', and then use the 'many' sign by dropping your upward-facing fists from your neck to your chest while splaying your fingers open. Finish with the sign for 'BOOK'.
2
How many apples do you want?
Sign 'APPLE', 'YOU', 'WANT', and then sign 'many'. Remember to furrow your eyebrows while signing 'many' to indicate that you are asking a 'wh-word' question.
3
There are many people here today.
Sign 'TODAY', 'HERE', 'PEOPLE', and then emphasize the sign for 'many' by making the dropping and opening motion slightly larger to visually represent a large crowd.