What I have learned from the Hacker Review

    The hacker review exercises were really a good way for me to learn grammar knowledge. As an international student, my English was not good enough, especially in terms of the grammar. This exercise was really helped me to make a better understanding of some grammar knowledge such as active and passive verbs, dangling modifiers, parallelism and needed words, etc.
    Here are three examples:

1. Parallelism
In 1998, a tsunami hit a populated coast in Papua new Guinea, killing two thousand people and wiping out whole towns.
This sentence is correct because the -ing form killing and wiping out are parallel.

2. Needed words
Christopher had an attention span longer than that of the other students.
The underlied words that of are needed because it is illogical to compare an attention span to students.

3. Choppy sentence
An instructor manual is enclosed with your computer. The manual is user-friendly.
A simple and and effective way of combining the sentence: A user-friendly manual is enclosed with your computer.

     Parallelism, needed words and choppy sentence were the most helpful exercises to me. The parallelism exercise help me to make sure that I use the parallel words or phrases correctly. The needed words exercise helped me understand when the relative words or relative adverbs are needed and when they were not necessary to exist in the sentence. The choppy sentence exercise help me to learn a single way to combine two sentences.
    All in all, this exercise was really helpful to me.