Grade 3 Fall — Personal Narrative, Complex Sentences with Subordinate Clauses, and Morphology with Affixes and Roots
English · VOC G3 eng.g3.f.voc.prefixes_com_sub

Recognize and use prefixes com-/con- ('together / with') and sub- ('under / below')

Identify com-/con- and sub- prefixes; strip the prefix to find the root; predict the meaning of new words by combining prefix-meaning with root-meaning. Apply in narrative writing and reading.

Mastery threshold
90%
Min instances
12
Typical minutes
35
Spaced intervals (days)
1, 3, 7, 14, 30, 60
Prereqs
Successors
  • eng.g3.s.voc.prefixes_pre_dis_mis
    (not yet loaded)
Common misconceptions
  • Reads 'come' or 'comma' as containing the prefix com- (false positive: the test is COM+root = together-meaning).
  • Reads 'subject' literally as 'under + ject' without recognizing the figurative meaning ('thrown under for discussion').

Exercise pool (2)

Diff Stem Type
3 Apply the detective routine on 4 words. For each: (a) strip the prefix; (b) name the prefix meaning; (c) name the root; (d) predict the... detective prefix com sub
3 Build one new word using COM-/CON- + a root, and one new word using SUB- + a root. Use each in a sentence. build new prefix word