Please say the singular word, say it in a sentence and repeat singular word again.
Look, write, cover and check is a good way to remember, but that will only work for those children with a good memory.
Try using scrabble letters, scrap paper and cut it up (they have to put it back together), jumble up the letters, make up a rhyme…
There are lots of creative ways to learn and practise spellings! Make it fun 🙂