All those words you mentioned fall under the part of speech called Prepositions! These types of words can be used in sentences to show us the place, time, or direction of something. For example: The cat is in the house Where is the cat?? The answer is a preposition:) If you found this helpful and you want to learn more then feel free to message me and we can learn together !

Hi Nada, these words are prepositions. It often depends on what you are saying. For example in and at can be used as prepositions of time or prepositions of place. ( I travel in December or The cake is in the tin. We go out at the end of the week or He is at the cafe). Time In: we use in to refer to a general, longer period of time, such as months, years, decades, or centuries. (In December, in 1990) At: we use at for the most specific times, and for holidays. (At lunch, At Christmas, At 11;30) For: used for saying what happened or existed during a short period before it changed. (For 2 weeks, For five years) Place In: we use in for the largest or most general places. (In South Africa, In Asia, In the river) At: or exact addresses or intersections, we use the preposition at. (The the post office, at the corner of 5th Avenue)

We use in and at for prepositions of time and place. For is used to indicate the reason or because of — I am so excited for you. For is used to indicate the duration or time — I lived in Italy for one year only. And to specify the use of something — She is studying for the test.

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