今夜は早く寝よう。
- Let’s go to bed early tonight.

今夜は早く寝よう。 meaning: Let's go to bed early tonight.

The sentence follows a typical Japanese sentence structure, which is Subject-Object-Verb (SOV), although the subject is often omitted if it's clear from the context. ⚫︎ The basic structure of 今夜は早く寝よう。 can be broken down as follows: - 今夜(konya): tonight (Time - acting as the topic) - は(wa): topic marker - 早く(hayaku): early (Adverb modifying the verb) - 寝よう(neyou): Let's sleep (Verb in the volitional form)

The particle は(wa) marks the topic of the sentence. ⚫︎ The topic is what the sentence is about. ⚫︎ In this case, 今夜(konya - tonight) is the topic. ⚫︎ It indicates that the speaker is talking about "tonight". ⚫︎ は(wa) often replaces particles like が(ga) or を(o) when introducing the topic.

The verb 寝よう(neyou) is in the volitional form, which expresses the speaker's intention or a suggestion to do something. ⚫︎ This form is used when the speaker wants to propose an action with others or express their own volition. ⚫︎ It roughly translates to "Let's..." or "I intend to...". ⚫︎ To form the volitional form: - For ru-verbs (verbs ending in -る), replace the -る with -よう. (e.g., 食べる(taberu - to eat) becomes 食べよう(tabeyou - Let's eat)) - For u-verbs, change the final -u sound to an -ou sound. (e.g., 寝る(neru - to sleep) becomes 寝よう(neyou - Let's sleep)). - Irregular verbs: する(suru - to do) becomes しよう(shiyou), and 来る(kuru - to come) becomes 来よう(koyou).

早く(hayaku) is an adverb. ⚫︎ Adverbs modify verbs, adjectives, or other adverbs. ⚫︎ In this sentence, 早く(hayaku) modifies the verb 寝る(neru - to sleep). ⚫︎ It indicates *how* the action of sleeping will be done, specifying that it will be done "early." ⚫︎ To form adverbs from い-adjectives, change the final い (i) to く (ku). (e.g., 早い(hayai - early) becomes 早く(hayaku))

The phrase 寝よう(neyou) is a very common and useful fixed expression. ⚫︎ It is the volitional form of the verb 寝る(neru), "to sleep." ⚫︎ It is always used to express the speaker's willingness to go to sleep. ⚫︎ This fixed expression often implies a suggestion or invitation to sleep. ⚫︎ Therefore, it is important to practice and remember this expression to improve your Japanese speaking skills.