Compound Particles - 1 - nitsuite, ni kanshite, wo megutte

Ni tsuite, ni kanshite, wo megutte - expressions that represent a target which has a connection

（１）最近、人生について考えることが多い。
（２）彼は消化器の治療に関して自信を持っていた。
（３）国会の会期延長をめぐって与野党が議論した。

• Ni tsuite and ni kanshite represent the targets of the action or state represented by the predicate.
• For ni tsuite, predicates such as think, speak, talk about, state, listen, write, check and other verbs related to the handling of the information according to language are used. For adjectives kuwashii and muchi da 無知だ can be used.
• ni kanshite can in many cases be used in place of ni tsuite. However it is somewhat unnatural to use ni kanshite with verbs related to thought.

? 最近、人生に関して考えることが多い。

• wo megutte is used with verbs such as debate, battle, oppose, and similar verbs and represents something that is the target of such conflict. wo megutte includes the sense of a the length of the process to reach a conclusion..
• wo megutte is natural for verbs that do not include a sense of information from language such as battle or conflict. For example in (3) above wo megutte is more natural.
• wo meguttte is not appropriate for a verb the subject of which is an individual unit.

X　講演会では環境問題をめぐって話しましょう。- not natural because there is a single speaker and wo megutte implies debate etc among multiple parties.

• Ni tsuite and ni kanshite can also be used instead of wa, where they are short for ni tsuite ieba or in kanshite ieba.
• ni tsuite can also be used to represent a ratio

紹介した客一人について５００円もらえる。