A practical english grammar - Vyssaja skola 1978

Clauses of manner
Sound symbols

Again, these are not very frequent, since manner is expressed most of the time by adverbs ending in -ly or by prepositional phrases. As intro­duces clauses of manner.

He didn’t do it as I thought he should.

Informal English often uses like instead of as in such clauses, to the intense displeasure of traditional grammarians. In fact, the use of like instead of as is one of the most notorious “errors” in speech today (along with the “double negative” mentioned earlier), and speakers must carefully avoid it if their speech is to be judged correct. Like is perfectly acceptable as a preposition (that is, if a noun construction follows it). Many speakers use the way as a conjunction, thus circum­venting the perils of as and like.

Do it like this. or:

Do it as I suggest.

Do it the way I suggest. or:

(Do it in the way I suggest).