Lesson 21   More forms of the prefix ad

ad + tack	= attack	ad + cuse	= accuse
ad + tend	= attend	ad + curate	= accurate
ad + tempt	= attempt	ad + commodate	= accommodate
ad + tract	= attract	ad + company	= accompany
ad + tach	= attach	ad + cumulate	= accumulate
ad + tention	= attention	ad + celerate	= accelerate
ad + titude	= attitude	ad + cented	= accented
		ad + customed	= accustomed
		ad + complished	= accomplished
		ad + quaint	= acquaint
		ad + quire	= acquire

1.	All of these words are formed with the prefix ad. What happens to ad when it is joined to a root that begins with the letter t? ___________________________________________________
2.	How does ad change before roots that begin with the letter c? ___________________________________________________ How does ad change before roots that begin with the letter q? ___________________________________________________
3.	Why does the spelling of the prefix ad change in these words? ___________________________________________________
4.	How many words have double consonants because of these spelling changes? __________

Lesson Generalization The adaptable ad changes before the letters t, c, and q. The prefix ad becomes at before roots that begin with the letter t. It becomes ac before roots that begin with a c or a q. Attract is easier to pronounce than adtract. Acquaint is easier to pronounce than adquaint. Remember why some of these words have double consonants. One of the letters belongs to the root. One belongs to the prefix.

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