It is raining.
I like cats.
possessive marker (archaic)
Archaic possessive use, equivalent to modern の. Now mostly seen in place names and literary contexts; often written as ヶ in such names.
The ヶ in Sekigahara derives from the old possessive particle が.
Conjunctive use meaning 'but' or 'although'. Often used to connect contrasting clauses, similar to けれども or が.
He is young, but he is reliable.
I tried hard, but I failed.
Used to connect clauses or items in a list, often with a nuance of 'and' or 'and also'. Common in formal or written Japanese.
He is a doctor and also a writer.
introductory remark marker
Used after an introductory remark or explanation to lead into the main point. Often translates as 'and', 'so', or is left untranslated.
Excuse me, but where is the station?
regardless of; whether ... or not
Follows the volitional or -まい form of a verb to mean 'regardless of whether...' or 'no matter...'.
Whether you go or not, the result will be the same.
desire/hope marker
Expresses a wish or hope, often in set phrases like ~たいものだ or ~ばいいのだが.
I hope spring comes soon.
sentence-softener; doubt marker
At the end of a sentence, softens a statement or indicates doubt, often leaving the thought incomplete. Can make a request or assertion less direct.
I have a small favor to ask (softening).
There is something that worries me a little.
This cake is delicious.
I want to go, but I don't have time.
Whether you go or not is up to you.
I wish I had a bit more time.
しかし is a sentence-initial conjunction meaning 'however', whereas が attaches directly to the end of the first clause to link two contrasting ideas.
が is the formal, written-register conjunction for 'but', while けど is its casual, spoken-language counterpart.
は marks the topic of a sentence while が marks the grammatical subject, so learners often mix up which one to use in a given sentence.
が marks the subject or the object of potential/desire predicates, while を marks the direct object of transitive verbs, a path, or a departure point—learners often mix them up with 好き/欲しい and with motion verbs.
Search-only form; used in place names for the archaic possessive sense.
Search-only katakana form; sometimes seen in place names for the archaic possessive sense.