Do you think you can write the spellings of all the words correctly? In order to spell words correctly you may follow certain guidelines, such as consult a dictionary whenever you are in doubt about the correct spelling of a word, write the word neatly and clearly, visualize the word in your mind, spell out the word loudly, pronounce the word loudly, study the syllables and pronounce, use mnemonics or memory aids for learning spellings, use the word at every opportunity when writing or speaking, etc.
Most of the nouns make their plurals by simply adding –s to the end (e.g. cat/cats, book/books). Some do change their endings, though. The main types of the nouns that do so are the nouns ending in –y. If the noun ends in -ch, -s, -sh, -x, or -z, add -es to form the plural. For Example, 1) church – churches, 2)bus- buses, 3) fox- foxes. With nouns that end in a consonant or a single vowel plus -f or -fe, change the -f or -fe to –ves. Nouns ending in -o can add either -s or -es in the plural, and some can be spelled either way.