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# 11.13: The Spelling <rr> and Assimilation

Difficulty Level: At Grade Created by: CK-12

## The Spelling <rr> and Assimilation

1. Here are the twenty words from the previous lesson that all contain <rr>:

irrigationoverripereferredarrestarrivalinterruptconferringscarredcorrectlycorruptionirritatepreferredarrangeirregularcorrespondunderratedtransferringirresponsiblesurrenderedsurroundings\begin{align*}& \text{irrigation} && \text{interrupt} && \text{irritate} && \text{underrated} \\ & \text{overripe} && \text{conferring} && \text{preferred} && \text{transferring} \\ & \text{referred} && \text{scarred} && \text{arrange} && \text{irresponsible} \\ & \text{arrest} && \text{correctly} && \text{irregular} && \text{surrendered} \\ & \text{arrival} && \text{corruption} && \text{correspond} && \text{surroundings}\end{align*}

You have seen that five of these twenty words have <rr> because of simple addition and five of them have <rr> because of twinning. Find these ten in the list above and cross them off.

2. When the prefixes ad-, com-, and in- are added to stems that start with an <r>, they assimilate to _______, _______, and ______.

3. Ten of the twenty words above with [r] spelled <rr> start with an assimilated form of ad-, com-, or in-. Find them, write them in the left column below, and analyze them to show the assimilation that leads to the <rr>:

Word Analysis: Prefix + Stem
irrigation in\begin{align*}\cancel{n}\end{align*} + r + rigation

4. The following words each contain two prefixes and a stem. See if you can analyze them to show where the <rr> comes from:

Word = Prefix\begin{align*}^1\end{align*} + Prefix\begin{align*}^2\end{align*} + Stem
incorrect = + +
rearrange = + +
unirritable = + +
overirrigated = + +
noninternational = + +
uncorrupted = + +
rearresting = + +
nonsupportive = + +
disarranged = + +
irresponsibly = + +
unsurprising = + +
reinterpret = + +
noninterrupted = + +
disinterested = + +

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