In to or INTO - On to or ONTO

INTO (preposition)

Into + object + modifiers of objects.

Examples:

• She put the toys into the basket.


• He walked into the room and found a mouse.


• The prince turned into a frog.

In to

In a phrase In is an adverb followed by the preposition to.

For example:

• Can you give this paper in to the office?


• He wouldn't give in to their demands.


• He gave his paper in to the teacher.

ONTO

Preposition meaning on top of (surface).

Examples:

• He threw the book onto the floor.


• He climbed onto the stage.

On to 

On (adverb) followed by the preposition to (in other words onward or toward)

Examples:

• He forwarded the email on to the clients.


• Students who pass their exams can go on to further education.

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