Identifying three common grammar mistakes

In this entry, we are required to state three common grammar mistakes that we make frequently. In the following paragraphs, I will be covering on 'independent and dependent clauses', ' subject/verb agreement' and 'preposition'.

An independent clause is a group of words that contains a subject and verb, expressing a complete thought. An independent clause is a sentence. Whereas, a dependent clause is a group of words that contains a subject and verb, but does not express a complete thought. A dependent clause cannot be a sentence. There are two types of words which we can use as connectors at the beginning of an independent clause: coordinating conjunctions and independent marker words. There are seven coordinating conjunctions which we can use, namely; and ,but,for,or,nor,so,and yet. An independent marker word is a connecting word used at the beginning of an inde pendent clause. Below are some of the examples using coordinating conjunctions and independent marker words as connectors.

1)Coordinating conjunctions: Peter went to McDonald to study,but he could not concentrate because of the noise.
2)Independent marker word: Peter went to McDonald to study; however,he could not concentrate because of the noise.

The second mistake to be discussed is the subject/verb agreement. The subject and verb should match in number, meaning that if the subject is plural, the verb should be a plural as well, and vice verse. Below are some of the examples in subject/verb agreement mistakes.

Mistakes:
1)Students is required to buy that textbook.
2)Below is some of the examples.
3) One of the boxes are open.
Corrections:
1)Students are required to buy that textbook.
2)Below are some of the examples.
3)One of the boxes is open.

Some of the common prepositions used are: on,at,in...etc. In this paragraph I will only be covering on the common mistakes made when using the following three prepositions; 'on','at' and 'in'. The word 'on' is used with days, 'at' is used with the time of the day, and 'in' is used with other parts of the day, months, years or seasons. Some examples of the common mistakes are further elaborated below.
Mistakes:
1) I will see you at Monday.
2) The movie starts on 6pm.
3) The book was published at 2008.
Corrections:
1) I will see you on Monday.
2) The movie starts at 6pm.
3) The book was published in 2008.

These are the few common grammar mistakes that I have encountered. Throughout my course of EG1471, I have a better understanding and awareness of such mistakes.