Omission of Prepositions
Cases where Prepositions are omitted
1.We do not normally use prepositions of time (on, in, at etc) before words like last, next or this.
We met him last month. (NOT I met him on last month.)
I met him on Sunday.
They might use it next time. (NOT They may use it at next time.)
2. Also note that prepositions are dropped in questions beginning with what / which + expression of time.
What time is the guest arriving? (NOT At what time is the guest arriving?)
What day is the meeting? (NOT On what day is the meeting?)
3. Different prepositions
Some words which have slightly different form and meaning take different prepositions after them.
Examples are: desire for but desirous of; confidence in but confident of
According to but in accordance with;
Sensible of but insensible to;
Affection for but affectionate to;
Ambition for but ambitious of;
4.The prepositions at / on / in are not normally used in expressions of time beginning with next, last, this, that, one, any, each, every, some and all.
He will come next week. (NOT He will comei n the next week.)
The manager is free this evening. (NOT The manager is free in this evening.)
5. The prepositions are not used before yesterday, the day before yesterday, tomorrow or the day after tomorrow.
My best friend is coming tomorrow. (NOT My best friend is coming on tomorrow.)
Tom met Huck yesterday. (NOT Tom met Huck on yesterday.)