मुझे यक़ीन है (mujhe yaqiin hai)

phrase A fixed conversational formula meaning 'I am sure/confident' -- built from मुझे (mujhe, 'to me'), यक़ीन (yaqiin, 'certainty/belief'), and है (hai, 'is'), following the dative-subject pattern the learner already knows from चाहिए and लगना.
Sense 1 : expressing personal certainty or confidence about something
phrase Functions as a standalone assertion or as a frame before a कि (ki) clause: मुझे यक़ीन है कि वह आएगा (mujhe yaqiin hai ki vah aaegaa, 'I am sure that he will come').
Synonyms: मुझे भरोसा है (mujhe bharosaa hai), मुझे पूरा विश्वास है (mujhe pooraa vishvaas hai, stronger emphasis)
Frequency: high
Cultural Note: This is one of those everyday phrases that feels almost automatic in Hindi conversation, said with a firm nod or a hand gesture for extra conviction. The nuqta in यक़ीन (yaqiin) marks its Persian-Urdu origin, and dropping it (यकीन, yakiin) is extremely common in casual writing and texting without any change in meaning.
Common Mistakes: 1) Learners often try मैं यक़ीन करता हूँ (main yaqiin kartaa hoon) as a direct translation of 'I believe,' but the dative-subject form मुझे यक़ीन है (mujhe yaqiin hai) is what native speakers actually reach for to express personal certainty in conversation. 2) Confusing यक़ीन (yaqiin, certainty about a fact) with विश्वास (vishvaas, trust in a person or faith) -- the two overlap but are not always interchangeable, especially when talking about trusting a person, where विश्वास (vishvaas) is preferred.
Sample Sentences:
मुझे यक़ीन है कि तुम यह काम कर लोगे। I am sure that you will manage to do this work.
(mujhe yaqiin hai ki tum yah kaam kar loge।)
Register: Neutral -- Mood: Indicative -- Tense: Future -- Voice: Active
मुझे यक़ीन है कि वह सच बोल रही है। I am sure she is telling the truth.
(mujhe yaqiin hai ki vah sach bol rahii hai।)
Register: Neutral -- Mood: Indicative -- Aspect: Continuous -- Tense: Present -- Voice: Active
मुझे यक़ीन था कि वह ज़रूर आएगा। I was sure that he would definitely come.
(mujhe yaqiin thaa ki vah zaroor aaegaa।)
Register: Neutral -- Mood: Indicative -- Tense: Past -- Voice: Active
मुझे यकीन है, सब ठीक हो जाएगा। I'm sure everything will turn out fine.
(mujhe yakiin hai, sab thiik ho jaaegaa।)
Register: Casual -- Mood: Indicative -- Tense: Future -- Voice: Active
अगर तुमने पूरी तैयारी की होती, तो मुझे यक़ीन होता कि तुम पास हो जाओगे। If you had prepared fully, I would have been sure that you'd pass.
(agar tumne poorii taiyaarii kii hotii, to mujhe yaqiin hotaa ki tum paas ho jaaoge।)
Register: Neutral -- Mood: Counterfactual -- Aspect: Perfective -- Voice: Active
मुझे पूरा यक़ीन है कि यह फ़ैसला सही है। I am completely sure that this decision is right.
(mujhe pooraa yaqiin hai ki yah faislaa sahii hai।)
Register: Neutral -- Mood: Indicative -- Tense: Present -- Voice: Active
मुझे यक़ीन है, हम इस मुश्किल से निकल आएँगे। I am confident we will get through this difficulty.
(mujhe yaqiin hai, ham is mushkil se nikal aaenge।)
Register: Formal -- Mood: Indicative -- Tense: Future -- Voice: Active
मुझे विश्वास है कि आपके प्रयासों से यह परियोजना अवश्य सफल होगी, मुझे यक़ीन है। I believe that with your efforts this project will surely succeed, I am sure of it.
(mujhe vishvaas hai ki aapke prayaason se yah pariyojnaa avashy saphal hogii, mujhe yaqiin hai।)
Register: Formal -- Mood: Indicative -- Tense: Future -- Voice: Active
मुझे यक़ीन है कि किसी दिन तुम अपनी मंज़िल तक पहुँचोगे ही। I am sure that someday you will surely reach your destination.
(mujhe yaqiin hai ki kisii din tum apnii manzil tak pahunchoge hii।)
Register: Literary -- Mood: Indicative -- Tense: Future -- Voice: Active
यकीन है यार, तू ये कर लेगा। I'm sure, man, you'll manage this.
(yakiin hai yaar, too ye kar legaa।)
Register: Casual -- Mood: Indicative -- Tense: Future -- Voice: Active
मुझे यक़ीन नहीं था कि वह इतनी जल्दी माफ़ी माँग लेगा। I wasn't sure that he would apologize so quickly.
(mujhe yaqiin nahiin thaa ki vah itnii jaldii maafii maang legaa।)
Register: Neutral -- Mood: Indicative -- Tense: Past -- Voice: Active