Difficulty Level: At Grade Created by: CK-12

1. Underline the letters that spell [ks] in these words. Remember that in words like likes the <e> is not helping spell the [ks], so you should underline just the <k> and <s>\begin{align*}<\mathrm{s}>\end{align*}:

mista\underline{k}e\underline{s}remar\underline{ks}fo\underline{x}wee\underline{ks}e\underline{x}pensepar\underline{ks}kno\underline{cks}ta\underline{x}estri\underline{cks}unmi\underline{x}edmechani\underline{cs}jo\underline{k}e\underline{s}blin\underline{ks}e\underline{x}erciseatta\underline{cks}rela\underline{x}es\begin{align*}& \text{mista\underline{k}e\underline{s}} && \text{e\underline{x}pense} && \text{tri\underline{cks}} && \text{blin\underline{ks}} \\ & \text{remar\underline{ks}} && \text{par\underline{ks}} && \text{unmi\underline{x}ed} && \text{e\underline{x}ercise} \\ & \text{fo\underline{x}} && \text{kno\underline{cks}} && \text{mechani\underline{cs}} && \text{atta\underline{cks}} \\ & \text{wee\underline{ks}} && \text{ta\underline{x}es} && \text{jo\underline{k}e\underline{s}} && \text{rela\underline{x}es}\end{align*}

2. Sort the words into these four groups:

Words in which [ks] is spelled . . .
<x> <ks> <cks> <cs>
fox mistakes knocks mechanics
expense remarks tricks
taxes weeks attacks
unmixed parks
exercise jokes

3. In the left column below write out the ten words you found with [ks] spelled <ks>, <cks>, or <cs>. Then analyze each one into its free stem and suffix:

Words with [ks] spelled <ks>, <cks> or <cs> = Free stem + suffix
mistakes = mistake + s
remarks = remark + s
weeks = week + s
parks = park + s
jokes = joke + s
knocks = knock + s
tricks = trick + s
attacks = attack + s
mechanics = mechanic + s

4. When [ks] is spelled <ks> or <cks> or <cs>, the <s>\begin{align*}<\mathrm{s}>\end{align*} is a suffix.

5. In the sixteen words you sorted out in this lesson [ks] is spelled <x> six times.

6. How Do You Spell [ks]? “The sound [ks] is usually spelled <x>, unless the [s] is a suffix.”

Watch the Middles!

remarks
PREFIX BASE SUFFIX
re mark s
re mark s
re mark s
re mark s
remarks
mistakes
PREFIX BASE SUFFIX
mis take s
mis take s
mis take s
mis take s
mistakes
relaxes
PREFIX BASE SUFFIX
re lax es
re lax es
re lax es
re lax es
relaxes
exercise
PREFIX BASE SUFFIX
ex erc ise
ex erc ise
ex erc ise
ex erc ise
exercise

Teaching Notes.

Though it most commonly spells [ks], <x> often spells the voiced counterpart, [gz], when it falls in between two vowels: exact, exaggerate, example, exist, luxury. In anxiety <x> spells [z], which it also spells at the front of words, as in xylophone. For more on [ks] see AES, pp. 370-72; for <x> spelling [gz], pp. 351-52; for <x> after eng,pp.436-37.

Middles. In exercise the base erc carries the meaning “contain, maintain” and is closely related to ark and the base in arcane. It is a bound base, which means that it cannot stand free as a word by itself. The students will begin to study bound bases in Lesson 43.

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