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Name _______________________________________
Lesson 28
Forms of the prefixes ob
and sub
| ob + struct |
= obstruct |
sub + stitute |
= substitute |
| ob + ject |
= object |
sub + marine |
= submarine |
| ob + tain |
=obtain |
sub + urban |
= suburban |
| ob + serve |
= observe |
sub + traction |
=subtraction |
| ob + pose |
= oppose |
sub + pose |
= suppose |
| ob + cupy |
= occupy |
sub + plies |
= supplies |
| ob + casion |
= occasion |
sub + cessful |
= successful |
| ob + ficial |
= official |
sub + ficient |
= sufficient |
| ob + fered |
= offered |
sub + gestion |
= suggestion |
The prefix ob
means "against" or "in the way of." The prefix sub
means "under," "below," or "in place of." Each of these prefixes can be spelled in
different ways. The spelling depends on the roots to which the prefix is joined.
| 1. |
The prefix ob has been added to each root in the first group.
How is the prefix spelled when joined to roots that begin with the letter p? _____ with the letter c? _____ with the letter f? _____
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| 2. |
The prefix sub
has been added to the second group of roots. How is the prefix spelled when joined
to roots that begin with the letter p? _____ with the letter c? _____ with the letter f? _____ with the letter g? _____
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| Lesson Generalization
The letter b
in the prefixes ob
and sub
often changes to blend more easily with the first letter of a root. When it changes
to match the letters p, c, f,
and g,
the result is a double consonant. Remember that one of the double letters in these
spelling words is a b
in disguise.
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Grade 6 Spelling SkillBuilders |
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