if a day

if Preposition

— If is used in a condition: — # When something will cause something else — #: If it rains, I will get wet. — # When a condition is not true — #: I'd prefer it if you took your shoes off. — # although — #: He was a great friend, if a little strange. — # When ... occurs (a programming statement). — #: If A, then B, else C.

if Subordinator

— If is used to report questions and things that are unknown. She asked if they had arrived yet. I don't know if I want to go or not.

if Noun

— If is a conditional situation. There are many ifs we need to consider before we start on the plan.

a Determinative

— A is used when the following word could be any of a certain type. Compare "A book I saw on the shelf" and "The book I gave you yesterday".

a Noun

— A is the first letter of the alphabet. The letter "a" comes before "b". — In some schools, an A is a very high grade. Ron got an A on his earth science test.

day Noun

— A day is a measure of time. — 24 hours — Seven days make one week — The time between midnight and the following midnight (or between sunset and sunset in Jewish reckoning) — The time between sunrise and sunset, when it is daylight — The part of a day spent at work or school He spent two days at work means that on two days he went to work; he did not spend 48 hours at work.