EXPLANATIONS
Explanation 1: at, in on
Explanation 2: at, in, on, no preposition
Explanation 3: full list of expressions with prepositions of time
Explanation 4: at, on, in, during, for, since, until, from-to
Explanation 5: before, after, during, for
Explanation 6: advanced grammar with exercises
Explanation 7: very clear
Explanation 8: for, during, while
EXERCISES
Exercise 1: fill in the gaps with AT-IN-ON or -
Exercise 2: fill in the gaps with AT-IN-ON or -
Exercise 3: choose AT-IN-ON or -
Exercise 4: choose BEFORE, AFTER, DURING, FOR
Exercise 5: choose the correct preposition (AT, IN, ON, UNTIL, no preposition)
Exercise 6: choose DURING, FOR, WHILE
Exercise 7: Choose FOR, WHILE, DURING
Exercise 8: choose FOR, WHILE, DURING
Exercise 9: different prepositions, three-option choice