When you get stuck midway through a sentence because you can't think of a word, try using thesaurus.com. Punch in a word and see what alternatives come up. As well as helping you with writing, it's also a way to improve your vocabulary for future struggles. When I wrote my latest story, I must have used this handy tool a total of at least 1000 times. wordhippo.com is also a helpful site. They include antonyms and etymologies of the words too.