To determine which of the given sentences are grammatically correct, we need to examine the verb forms and their appropriate usage in each sentence.

Verbs: Wake, Woke, Woken, Waken, Wakened

Understanding the different forms of the verb "wake" and "waken" is crucial for this analysis:

• The base form of the verb is wake.
• The simple past tense of "wake" is woke.
• The past participle of "wake" is woken.
• There is also the verb waken, which is primarily a transitive verb meaning to rouse from sleep.
• The simple past tense of "waken" is wakened.
• The past participle of "waken" is wakened.

Sentence (i): I woke up from sleep

This sentence uses "woke," which is the simple past tense of the verb "wake." The phrasal verb "wake up" is commonly used to describe the action of coming out of sleep. This sentence correctly uses the simple past tense to describe a completed action.

Verdict: Grammatically CORRECT.

Sentence (ii): I woked up from sleep

The form "woked" is not a correct past tense form of "wake." The correct simple past tense is "woke." Therefore, the use of "woked" makes this sentence grammatically incorrect.

Verdict: Grammatically INCORRECT.

Sentence (iii): I was woken up from sleep

This sentence uses the passive voice structure ("was" + past participle). "Woken" is the correct past participle form of "wake." In the passive voice, this sentence implies that someone or something caused the person to wake up (e.g., "I was woken up by the alarm"). This is a valid and commonly used grammatical construction.

Verdict: Grammatically CORRECT.

Sentence (iv): I was wakened up from sleep

The verb "waken" means to rouse someone from sleep, and its past participle is "wakened." While "I was wakened from sleep" would be grammatically correct (meaning someone roused me from sleep), the addition of "up" to "wakened" creates a phrasing that is generally considered less idiomatic or redundant in standard English. The more natural and commonly accepted passive form using "wake" in this context is "was woken up." Therefore, this sentence is typically considered less grammatically natural or incorrect in common usage compared to sentence (iii).

Verdict: Grammatically INCORRECT due to unidiomatic phrasing with "up".

Conclusion on Grammatically Correct Sentences

Based on the analysis of verb forms and common English usage:

• Sentence (i) is grammatically correct.
• Sentence (ii) is grammatically incorrect.
• Sentence (iii) is grammatically correct.
• Sentence (iv) is grammatically incorrect.

Therefore, the sentences that are grammatically correct are (i) and (iii).