There are lots of online activities in the Grammar section. Here you will find links to all of them collected in one, easy-to-access, easy-to-search place.
The links are grouped by resource type into three categories (lessons, exercises, tests). Within each category, they are sorted by parts of speech, then listed by grammar topic (for example, verb be, verb have got, and so on).
You can also browse the grammar section by parts of speech. In this case, the links are divided in two categories (nouns and verbs). Within each category, they are sorted by grammar topic, then listed by resource type (for example, lessons, exercises).
We hope the links below can be useful in helping you to find and choose suitable material for your ESL students.