You are allowed to start a sentence with 'however. ... Usage experts have been advising people not to begin sentences with 'however' for at least a hundred years. However, many famous writers—including Jane Austen and Charlotte Brontë—have used the word this way. However.

How do you use However in a sentence?

"The movie got good reviews; however, it was very long." "I'm going to buy a car; however, I'll have to use all of my savings." "I'm not excited about going; however, I'll go to support you." "I have a lot of homework tonight; however, I made a promise to go with her."

What words should you not start a sentence with?

A sentence should not commence with the conjunctions and, for, or however....