Recognize and use prefixes com-/con- ('together / with') and sub- ('under / below')
Exercise Difficulty 3 ~6 min eng.g3.f.ex_31

Detective Prefix Com Sub

Prompt

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 whole-word meaning. Words: SUBMARINE, SUBTRACT, COMBINE, CONNECT.

M-3-F-EX-31 Illustration
Reference image of a detective worksheet template with first row filled out for SUBMARINE: WORD=submarine, PREFIX=sub, M

Reference image of a detective worksheet template with first row filled out for SUBMARINE: WORD=submarine, PREFIX=sub, MEANING=under, ROOT=marine (sea), PREDICTED=under the sea. Print-ready 8.5x11.

How it's presented
mode structured form
fields
WORDPREFIXPREFIX MEANINGROOTPREDICTED MEANING
Answer criteria
type rubric
criteria
  1. 4 words processed
  2. Prefix correctly identified each time
  3. Meaning correctly named
  4. Predicted meaning is reasonable
Hints
  1. COM-/CON- = together. SUB- = under.
  2. Check your prediction against a real definition.
Misconceptions to watch
  • Strips COM- from 'come'.
  • Predicts SUBTRACT as 'under throw' (root is TRACT = pull).
Used in lessons