4.42 suggestions
There are several ways in which you can make a suggestion:
* you can use the modal 'could' in a declarative sentence (see paragraph 4.187)
* you can use a negative 'wh'-question beginning with 'why'
* you can use a question consisting of 'what about' or 'how about' in front of a non-finite clause
* you can use the imperative mood.
You can also make a suggestion about what you and someone else might do by using 'let's'. This use is explained in paragraph 4.35.