You can get hours of extra Grammar 4 practice. Here are links from other ESL websites. (Thank you to these ESL websites.)
You may want to bookmark this page so you can find it again later.
Gerunds and Infinitives Group 1 (Quizlet practice using words found in Grammar Workbook, page 5)
parallelism (See exercises at the bottom of the linked page.)
either and neither (See exercises at the bottom of the linked page.)
both..and (See exercises at the bottom of the linked page.)
past perfect 1(See exercises at the bottom of the linked page.)
past perfect 2 (See exercises at the bottom of the linked page.)
time clauses + verb tense review (including past perfect)
adjective clause summary and practice (click on links)
using which to describe a sentence (See exercises at the bottom of the linked page.)
unexpected result (although) vs. cause (because) 1(See exercises at the bottom of the linked page.)
clauses with if / unless / only if / even if (See exercises at the bottom of the linked page.)
clauses with in the event / in case (See exercises at the bottom of the linked page.)