Page 238 - Easy Japanese - Learn to Speak Japanese Quickly! (TUTTLE)

The less desirable alternative can be placed before yori “than” in the Informal
form.
Sushi wa tsukuru yori katta hō Buying sushi is better than
ga i’i. making it.

Benkyō-shinai yori shita hō ga Studying would be better than
i’i. not studying.

You can also compare two states, being or not being a certain way, using
adjectives and nouns.

Benri na hō ga i’i. It’s better if it is convenient.
Takai yori yasui hō ga i’i. It’s better if it’s cheap than
expensive.

GRAMMAR NOTE X ka mo shirenai = “Might be” or “Possibly”

Ka mo shirenai and its formal version ka mo shiremasen mean “might be” or
“possibly”. (Note that it’s shiREnai, not shiRAnai.) They follow the Informal
form of a predicate, and indicate uncertainty or possibility of the proposition.

Kaze ka mo shirenai. I may have a cold.
Chotto muzukashi’i ka mo It may be difficult.

shiremasen yo.
Satō-san wa kaetta ka mo shirenai. Ms. Sato may have gone
home.

When the sentence has a noun predicate, da drops before ka mo shirenai, but

datta stays.
Ame ka mo shirenai. It may rain.

Ame datta ka mo shirenai. It may have rained.

How is ka mo shirenai different from deshō/darō “probably”? Both indicate
uncertainty, but ka mo shirenai usually indicates being less certain than
deshō/darō. In fact, you can use both in order to express the different levels of
certainty as follows.
Ashita wa i’i otenki deshō. Demo ame ka mo shiremasen.

It will probably be sunny tomorrow. However, it’s possible that it will rain.