What is better to use in a sentence keep or kept?

The choice between "keep" and "kept" depends on the tense of your sentence:

Keep:

* Present tense: "I keep my keys in my pocket."

* Present continuous tense: "I am keeping my promise."

* Future tense: "I will keep trying."

* Imperative mood: "Keep quiet!"

Kept:

* Past tense: "I kept my promise."

* Past participle (used in perfect tenses): "I have kept my promise."

* Past participle (used in passive voice): "The secret was kept safe."

Example sentences:

* Present tense: "I keep my phone on silent mode."

* Past tense: "She kept her word."

* Future tense: "He will keep fighting."

* Past participle: "They have kept the tradition alive for generations."

In summary:

* Use "keep" for present, present continuous, future tense, and imperative mood.

* Use "kept" for past tense, past participle, and passive voice.