(1) An idiom is a phase whose meaning cannot necessarily be guessed from the meanings of its constituent words. 'That fly ball was a can of corn.'
(2) A conditional uses particular forms to express implied conditions or suppositions. It usually contains a pair of clauses equivalent to 'if ..., then....' There are three classic conditional sentence forms (I, II, III of course):
'If it rains tomorrow, then I will get wet.'
'If it rained tomorrow, then I would get wet.'
'If it had rained yesterday, then I would have gotten wet.'
English has an endless accumulation of idioms, and the topic of conditionals is large and disputable, but this is a beginning.
I'm not sure what an idiom is?...Also what is a conditional? I'm still a little confused and was wondering if you please help me!
An idiom is a phrase where the words together have a different meaning form the dictionary definition of the individual words. For example, a 'good egg'is used idiomatically to mean a person you can trust. Click here for a list of common idioms.
A conditional is where there are two linked actions, the second of which will only be possible if the first happens:
If you see her, will you give her this letter. (You can only give the letter to the persaon if the condition in the first part (seeing her) is met.