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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>:

\begin{align*}& \text{irrigation} && \text{interrupt}\surd && \text{irritate} && \text{underrated}\surd \\ & \text{overripe}\surd && \text{conferring}\surd && \text{preferred}\surd && \text{transferring}\surd \\ & \text{referred}\surd && \text{scarred}\surd && \text{arrange} && \text{irresponsible} \\ & \text{arrest} && \text{correctly} && \text{irregular} && \text{surrendered}\surd \\ & \text{arrival} && \text{corruption} && \text{correspond} && \text{surroundings}\surd\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 ar , cor-, and ir- .

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 i\begin{align*}\cancel{n}\end{align*} + r + rigation
arrest a\begin{align*}\cancel{d}\end{align*}+ r + rest
arrival a\begin{align*}\cancel{d}\end{align*} + r + rival
correctly co\begin{align*}\cancel{m}\end{align*} + r + rectly
corruption co\begin{align*}\cancel{m}\end{align*}+ r + ruption
irritate i\begin{align*}\cancel{n}\end{align*} + r + ritate
arrange a\begin{align*}\cancel{d}\end{align*} + r + range
irregular i\begin{align*}\cancel{n}\end{align*} + r + regular
correspond co\begin{align*}\cancel{m}\end{align*} + r + respond
irresponsible i\begin{align*}\cancel{n}\end{align*} + r + responsible

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*}^{1}\end{align*} + Stem
incorrect = in + co\begin{align*}\cancel{m}\end{align*} + r + rect
unirritable = un + i\begin{align*}\cancel{n}\end{align*} + r + ritable
overirrigated = over + i\begin{align*}\cancel{n}\end{align*}+ r + rigated
uncorrupted = un + co\begin{align*}\cancel{m}\end{align*}+ r + rupted
rearresting = re + a\begin{align*}\cancel{d}\end{align*}+ r + resting
nonsuppotive = non + su\begin{align*}\cancel{b}\end{align*}+ p + portive
disarranged = dis + a\begin{align*}\cancel{d}\end{align*}+ r + rested
irresponsibly = i\begin{align*}\cancel{n}\end{align*}+ r + re + sponsibly
unsurprising = un + sur + prising
reninterrupted = re + inter + pret
noninterrupted = non + inter + rupted
disinterested = dis + inter + ested

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