No.
They are all the same singular.
No, there is no singular form of macaroni, ravioli, or tagliatelli. These are all plural nouns that refer to types of pasta.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "stratum" is "stratum." The word does not change in its singular form.
The singular form of "oases" is "oasis."
The singular form of "dice" is "die."
The singular form of "wash" is "washing."
The word "macaroni" is a plural noun. The singular form of it is "macarono."
The plural form for the singular noun macaroon is macaroons.The plural form for the singular noun macaroni is macaronis.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of feet is foot.
The singular form of "hypothysis" is "hypothesis."
The singular form is ombudsman.
it is already in its singular form.
The singular form is hilum.
The singular form is money.
The singular form of "cuffs" is cuff.
The singular form in stimulus.
The singular form for the plural noun stories is story.