Yes, usually.
Yes. It can be used as long as it is followed by a comma and it refers to a statement previously made. Therefore, however, hence and thus are usually followed by a comma, as in:"Therefore, our idea should not be implemented."See the helpful link below for more information.
No it is not a complete sentence on its own. It is because there should be something before Therefore.
Unfortunately is often used to join independent clauses and should therefore be preceded by a semicolon and followed by a comma. For example, "I was so excited about going to the concert; unfortunately, I got a painful sinus infection and was not able to go."
The next word should be capitalized.
The grammatical error in this sentence is the tense inconsistency. The verb "followed" should be in the past perfect tense to match the conditional verb "would not have fought." The corrected sentence would be "He would not have fought them if they had followed his advice."
If should be followed by a dependent clause, a comma, an independent clause and then a period.
The future tense! However the question should have been preceded by a comma and put in inverted commas ending with a question mark! There should be no question mark in this sentence this is not a question.
When an adverb begins a sentence, it should be followed by a comma to separate it from the rest of the sentence's information. This helps to clarify the role of the adverb in modifying the verb or adjective that follows.
"What are its" is grammatically accurate. "Its" is a possessive pronoun and should be followed by a plural verb, which is "are."
Put a comma after Lastly. You are beginning your sentence with an adverb, however, your adverb is not modifying any other word. Therefore, it must be set off from what follows. Lastly should be preceded by a period or semicolon to show it begins a sentence.
Yes. 'Thus' is another word for 'therefore'. Thus the sentence you start of with 'thus' should be an explanatory sentence.
No, there should not always be a comma after the word "hopefully." It depends on the sentence structure. When "hopefully" is at the beginning of a sentence, it is often followed by a comma, but if it is used within a sentence, a comma is not necessary.