Using the Conjunction कि

Generally, no. In English, "I think he is nice" is fine. In Hindi, मुझे लगता है वह अच्छा है sounds disjointed. Better to always include कि.

Nope! कि is immutable. It never changes gender, number, or case. It's the sturdy rock of Hindi grammar.

Yes, it was likely a typo. Even native speakers make this typo constantly on social media because the keys are close on phonetic keyboards. Don't copy them!

Sometimes! In older or poetic Hindi, you might see कि used where we'd expect क्योंकि (kyunki). E.g., "Help me, ki (for/because) I am weak." But stick to क्योंकि for 'because' to be clear.

कि is just the connector 'that'. क्योंकि literally means 'because' (it's actually a combo of kya + ki historically). If you are giving a reason, use क्योंकि.

Mostly, yes. कहा कि (said that), सुना कि (heard that). But it can also come after nouns in phrases like बात यह है कि (the matter is that).

You type the 'k' sound first, then the short 'i' matra (usually 'f' key on Inscript). Even though the line is on the left, you type the consonant first in most phonetic inputs.

Not at all. It's used in slang, street talk, news, and formal speeches. It is universal.

No. For 'The car *which* is red', use जो (jo). कि is for facts/statements, जो is for describing nouns.

It implies a continuation from a previous speaker or thought. Like "...That he wouldn't come." It's rare and stylistic.

Not directly, but often the next clause is in the subjunctive if it's a wish/request. "I want ki you *go* (subjunctive)."

Short and sharp. Don't drag it. It shouldn't sound like the English word "Key". It sounds like the ki in "Kiss".

Yes! "मुझे नहीं पता कि वह आएगा या नहीं" (I don't know *whether/that* he will come or not).

Yes! Indian teachers often call कि "Chhoti Ki" (Small Ki) and की "Badi Ki" (Big Ki) to help kids distinguish them.

Yes. "खुश हूँ कि..." (Am happy that...). "दुखी हूँ कि..." (Am sad that...).

Laziness or autocorrect! In proper transliteration, ki is the conjunction and ki (or kee) is the possessive. Context usually tells you which is which.

Not really. It's a unique function word. For 'so that', you can use ताकि, but for the simple connector 'that', कि is the only game in town.

Usually a micro-pause happens *after* कि, not before it. "Usne kaha ki... [tiny pause]... tum jao."

Yes, "Usne kaha कि Radha ne kaha कि..." It's grammatically fine but can get confusing, just like in English.

It is used in both standard Hindi and Urdu identically. It comes from Persian originally, but it's fully native to modern Hindustani.