The possibilities are endless, and you will do better if you choose clearly which one you intend. Very often, a sentence with a weak verb will also contain a nominalization whose inner verb should be the grammatical verb of the sentence. Using this principle, you can rewrite your sentences one at a time with little regard for their surrounding context. Most of the old-fashioned books on good writing will explain this process in detail. Find all the connectives in ten pages of your own writing.
Some people can write very quickly.
The writing that results, however, is usually redundant. The individual sentences might look impressive, but the same ideas will be expressed over and over. Slow down, figure out what you're really trying to say, and say it well, once. If you care about language them you will never stop trying to improve your writing. But once you internalize some voices and integrate their perceptions into your writing, you will write with much greater confidence.