ように

The pattern ように is used to express purpose when the goal involves a state of being, a potential ability, or a negative outcome to be avoided. It is also used for indirect requests, wishes, gentle commands, describing similarity, and stating 'as...'.

1. Verb Connections for Purpose:
Unlike ために, which takes volitional verbs (actions you can control), ように primarily attaches to non-volitional verbs or negative verbs:

• Non-volitional verbs: This includes potential forms (e.g., 買えるように（かえるように） - so that I can buy), non-volitional intransitive verbs (e.g., 届くように（とどくように） - so that it reaches), and state verbs (e.g., 分かるように（わかるように） - so that one understands).
• Negative forms: Any verb in the negative form (e.g., 忘れないように（わすれないように） - so that one doesn't forget).

2. Subject Flexibility:
While volitional verbs usually require ために, they can be used with ように if the subject of the goal clause and the main action clause are different (e.g., 'I did X so that he would do Y').

3. Indirect Requests:
It is frequently used with verbs of communication like 言う（いう） or 頼む（たのむ） to report an indirect request or command (e.g., ようにと言う - tell someone to do something).

4. Wishes and Prayers:
When placed at the end of a sentence, it expresses a wish or prayer. Note that for this specific usage, ように typically attaches to the polite form (ます / ません) rather than the dictionary form (e.g., 合格しますように（ごうかくしますように） - I hope I pass).

5. Direct Instructions / Gentle Commands:
When used by itself at the end of a sentence, ように can function as a gentle command, reminder, or instruction. It is often used by parents, teachers, or on signs (e.g., 明日は遅れないように。（あしたはおくれないように。） - Please make sure not to be late tomorrow.).

6. Similarity and Appearance:
Related to the similarity pattern よう（様）, it can describe something behaving or appearing like something else. When attaching to a noun, the particle の is required (Noun + の + ように) (e.g., 猫のように（ねこのように） - like a cat). Note the distinction: ように modifies verbs or adjectives (adverbial), whereas ような modifies nouns (e.g., 猫のような声（ねこのようなこえ） - a voice like a cat).

7. 'As...' (Introduction/Reference):
ように is also commonly used to mean 'as [you know / I said / you can see]' when introducing information or referring to something already known (e.g., ご存じのように（ごぞんじのように） - as you know; 前に話したように（まえにはなしたように） - as I mentioned before).

8. Effort and Change:
It forms the basis for ようにする (making an effort to do something) and ようになる (a change in state or ability).

9. Nuance:
It implies that the speaker is doing their best to make a certain result likely, rather than executing a direct, guaranteed plan.