However and Moreover

However and moreover are described either as a transitional or conjunctive adverbs. They are also described as conjunctions because they function to join sentences. These adverbs along with nevertheless, therefore, furthermore among others show a continuation and the relationship between sentences.

Consider these sentences:
A. She left early; however, she did not meet the man.
B. She met the man; moreover, she left early.

The sentences A and B above have different meaning. In Sentence A, the second sentence introduced with however contradicts with the first sentence. She failed to meet the man as expected despite leaving early. Thus, the outcome has an opposite result with her actions. In sentence B, the outcome is the resultant effect of her action in that, she met with the man because of her leaving early.

Therefore, while  however shows a contradiction in sentences, moreover states the agreement in sentences. However can be replaced with the coordinating conjunction but.
She left early but did not the man.

More examples of however and moreover in sentences:
1. The prefect complained to the principal; however, the principal refused to act.
2. The principal acted on the matter. Moreover, the prefect had complained.
3. The community hired the men as guards. The men, however, did not secure the community.
4. The men secured the community well; moreover, they were contracted for it.
5. I, however, will not contest in the election.
6. Tobacco is prohibited in our county; moreover, it is dangerous to our health.

In applying conjunctive adverbs into sentences, there are some things to be placed under consideration.

First, conjunctive adverbs link clauses together. When using them for this purpose,the accepted punctuation are the full stop and semi-colon(;)
The boy is a racer however he still acts well (wrong) or the boy is a racer however, he still acts well(wrong)
The boy is a racer; however, he still acts well ( correct) or
The boy is a racer. However, he still acts well (correct)
The group excelled at the competition; moreover, they had prepared for it.
He was not bothered with the arrangement of the house. Moreover, he knew who is responsible for it.

When placed for emphasis or in the middle of a sentence, place a comma(,) before and after the transitional adverbs.
I, however, will not contest in the election.
The sporting event, however, commenced despite the weather.

If the transitional adverb such as however is to appear first in the sentence, place a comma after it.
However, we will still be friends.
However, hostel facilities will be a better option.
Moreover, the country is still the giant of Africa.

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