2

I want to know what type of sentence the sentence below is and why we use two past participles in it.I took this sentence from a chemistry book; chemistry is my subject.

1) Concentration of CO2 and water vapour absorb infrared radiation emitted by earth surface.

Improve this question
2
  • 1
    Look up infrared in a dictionary: it's not a participle, infrare + -d but an adjective/color name, infra + red, like ultraviolet.
    – StoneyB on hiatus
    Jul 20, 2016 at 10:57
  • The sentence works in the same way as saying: ... radiation which is emitted by earth surface. It's a participle clause.
    – Schwale
    Jul 20, 2016 at 20:21

1 Answer 1

Reset to default
2

In English there are many irregular verbs (Ex: 'to see' is an irregular verbs: the past is 'I saw' not 'I seed').

'Infrared' isn't a verb at all. 'Infrared' is 'infra' + 'red'.

'Emit' uses rules for regular verbs (verbs + ed) and we can divide 'emitted' into 'emit' (verb in present form) + 'ed'. Using this rule it should be 'emited', but in English when there is a consonant you have to double it and the full word becomes 'emitted'.

If you want look at some other forms of the verb to 'emit', you can look here

Improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .