Verb-irregularities, overview

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Conjugation:	Rule III:  ie, y (verb with ie/y-replacement)
Application:	the verb ends on "ie" in Present Participle (Gerund) the "ie" becomes "y"
Example verb:	irregular verb to lie (lay, lain)

Indicative (simple forms)

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Present	Past	Future I
I lie	I lay	I will lie
you lie	you lay	you will lie
he lies	he lay	he will lie
we lie	we lay	we will lie
you lie	you lay	you will lie
they lie	they lay	they will lie

Present Perfect	Past Perfect	Future II
I have lain	I had lain	I will have lain
you have lain	you had lain	you will have lain
he has lain	he had lain	he will have lain
we have lain	we had lain	we will have lain
you have lain	you had lain	you will have lain
they have lain	they had lain	they will have lain

Indicative (continuous forms)

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Present	Past	Future I
I am lying	I was lying	I will be lying
you are lying	you were lying	you will be lying
he is lying	he was lying	he will be lying
we are lying	we were lying	we will be lying
you are lying	you were lying	you will be lying
they are lying	they were lying	they will be lying

Present Perfect	Past Perfect	Future II
I have been lying	I had been lying	I will have been lying
you have been lying	you had been lying	you will have been lying
he has been lying	he had been lying	he will have been lying
we have been lying	we had been lying	we will have been lying
you have been lying	you had been lying	you will have been lying
they have been lying	they had been lying	they will have been lying

Conditional (simple forms)

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Conditional I	Conditional II
I would lie	I would have lain
you would lie	you would have lain
he would lie	he would have lain
we would lie	we would have lain
you would lie	you would have lain
they would lie	they would have lain

Conditional (continuous forms)

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Conditional I	Conditional II
I would be lying	I would have been lying
you would be lying	you would have been lying
he would be lying	he would have been lying
we would be lying	we would have been lying
you would be lying	you would have been lying
they would be lying	they would have been lying

Imperative

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lie

Participle

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Present / Gerund	Past
lying	lain