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9.14: The Prefixes ob- and dis- and More Work with Bound Bases

Difficulty Level: At Grade Created by: CK-12
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The Prefixes ob- and dis- and More Work with Bound Bases

1. The prefix ob- usually adds the meaning “to, toward, on, over, or against.” The <b> in ob- assimilates fully or partially when ob- is added to certain stems. Analyze each of these words as instructed. Each word starts with a form of ob-:

Word = Prefix + Stem
offer = +
object = +
obstruct = +
opportunity = +
occur = +
omit = +
omission = +

2. The prefix dis- usually means either “lack of, not” as in disorder and dishonest, or “removal, reversal” as in disassemble. Usually the prefix dis- is added to a stem by simple addition, but sometimes the <s> assimilates fully or partially. Each of the following words contains some form of the prefix dis-. Analyze each word as instructed:

Word = Prefix + Stem
discontent = +
difficult = +
discomfort = +
directing = +
divides = +
discontinue = +
division = +
omission = +
disproof = +
divorced = +
disappoint = +

3. Each of the following words contains a bound base and a prefix. Some contain a suffix. Analyze each word:

Word = Analysis
convict =
addicted =
exploring =
congress =
correct =
suggest =
objects =
respectful =
indictment =
adjective =
announcer =
instructing =
collected =
suffering =
elects =
editor =
consisting =

4. The bound base spect means “look at, see.” Sometimes when prefixes are added to spect unusual assimilations take place. Each word contains the bound base spect Analyze each word into its prefix and stem:

Word = Prefix + Stem
suspect = +
prospect = +
aspect = +
inspect = +
respect = +
perspective = +
expect = +

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Grades:
1 , 2 , 3 , 4 , 5
Date Created:
Feb 23, 2012
Last Modified:
Jan 16, 2015
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