Onset-rimes are comprised of two parts. The onset is the beginning sound that can be heard when words are sounded out. The rime is the part of the word that is left after the onset is removed. When the two parts are separated, it is called onset-rime segmentation.
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One-letter onsets are not blends or chunks, but they are single letters at the beginning of a rime. One-letter onsets are a single syllable. The "c" in cat is a one-letter onset, as well as the "h" in house. The letter stands alone from the rest of the rime. A list of common word families that occur in the one-letter onset-rime group is: best, head, light, sink, tick, coat, tub, bug, hand and pail. Removing the one-letter onset you can create another one-letter onset-rime or if you add a blend, then you will have used a two-letter onset.
Two-letter onsets are made up of blends that typically start a sentence. A blend is when two syllables come together to make a new sound different from the original sound. The English language has 35 double letter blends. A list of blends that make up some of the two-letter onsets: ch., tr, sh, th, bl, pl, sn, th, br and pr. With an onset-rime such as, bread, the onset rime is the "br."
It is important to classify the difference between a two-letter onset and a one-letter onset when it is time to segment. Teachers use segmentation to help students to build rhyming words and patterns. The teacher will model removing the onset and say the remaining rime. When students add another onset to the rime, they have created a rhyming pair. For example if a teacher says, "dog." She would drop off the "d" and be left with "og." When the students add "fr" and say the word, "frog," they have found a pair of rhyming words. It is an important skill for children to be able to segment onset-rimes, as it is an early reading skill. When children have difficulty segmenting the onset-rimes, they often have trouble learning to read later.
Activities Based on Onset-Rimes
Within a classroom, a teacher can use her pocket chart to play a game with her students. She can write out several words and ask the students what part she will need to remove to create new rhymes. When they tell her to remove the onset, she can cut off the first letter. She then can place the rime into the pocket chart and ask students to write out new onsets to create rhyming words with the original onset-rime. The book, "Andy that's My Name," by Tommie dePaola is a good example to use to introduce onset-rimes, as the characters build words with a boy, Andy's name.
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