When To Use A Semicolon With However

Using however to begin a sentence.
When to use a semicolon with however. Join two contrasting sentences using. This study has however demonstrated comparable rate further supporting the use of traps. This one needs a semicolon. Since both sentences have only one independent clause each it would be appropriate to instead use a comma before and after however. Comma and coordinating conjunction.
The first is using it as a conjunctive adverb. A semicolon could only be used here if the word however was the beginning of a new independent clause. In this sense the meaning of however is that the independent clause that follows counters the independent clause before it denying it giving a caveat stating something as true that we would not expect considering the first clause etc. Use a period full stop or a semicolon before however a transitional phrase like however will usually start a new sentence but if you would like a smoother transition than that afforded by a period you can use a semicolon before it to merge the new sentence with the previous one. This shows that the second sentence is in opposition in some way to the first.
When you are wondering what mark to use ask if however is part of the first thought or the second thought. Here are some examples transitional phrases shaded. When you have two full sentences that are in opposition or contrast to one another but are closely connected join them with a semicolon the word however and a comma. Commas semicolons with however and other conjunctive adverbs when combining two sentences into one compound sentence a comma and a coordinating conjunction and but or nor for so yet are used. Use a semi colon before and a comma after however when you are using it to write a compound sentence.
However peter is leaving now. If however is used to begin a sentence it must be followed by a comma and what appears after the comma must be a complete sentence. Use a semicolon and comma with however moreover therefore and furthermore to introduce a new independent clause in a sentence. In those sentences however is used to mark a contrast with the preceding thought and a semicolon before it is appropriate because a stronger mark of separation is needed at that location.