Morphological knowledge allows children to expand their vocabulary from a smaller set of root words to form more words. For example, morphological knowledge in English allows children to form more words from a single word, as is the case with the word child: childless, childlike, and childish; it also allows children to make grammatical inflections such as adding -ed to verbs to create past tense worked, and adding ·ing to form present progressive work!!!.i_. Moreover, it allows children to produce plurals ( dogs) and possessives ( Peter's) and to create prefixes (P!:!._-read) and suffixes (friendless)
The idea that the children learn the root word first before adding any prefixes or endings seems like common sense. I believe this practice should be carried in later schooling when the children are facing more difficult words. Teachers should expect to break down the words into smaller parts that are easily understood by students