(A proofreader's note regarding “into” and “onto”)

“Onto” and “into” of prepositions are, 

Pointing us forward while standing before;

Signs at the crossroads of grammar, they star,

Granted the basics of “on,” “in,” at core.

Both tell of movement toward a result,

Signifying motion when simply they're used.

“Into” is shifting from outside to in;

“Onto” is reaching a surface to roost.

“Into” brings more when in phrasal-type verbs—

Different in meaning they are from their parts.

One such example is “look into” this,

Which says “investigate” plying some smarts.

Best then to know what these phrasal verbs are,

Whether or not actual movement applies.

Phrasal verbs ending with “on” or an “in”

Conversely show where a “to” has no ties;

“Drop in” and “check in” and “give in,” alike,

Stand without “to” as appendage to “in.”

With such verbs phrasal, the “to” is apart,

Coming as separate if needed as kin.

“‘Drop in to see all the pastries galore

Moved into displays to capture the eye.'”

"Driven by purpose, you strode into store;

Eyes bright and shining, you latched onto pie.”