As a verb:
* Present Tense: The ship sails across the ocean.
* Past Tense: The pirate ship sailed under the black flag.
* Future Tense: We will sail to the Caribbean next year.
* Imperative: Sail the boat downwind!
As a noun:
* The sail billowed in the wind.
* We need a new sail for the dinghy.
In a phrase:
* Under sail: The ship was moving quickly under sail.
* Set sail: They set sail for a new adventure.
In a complete sentence:
* The bright red sail of the sailboat stood out against the blue sky.
* We watched as the sailboat gracefully sailed across the lake.
* The captain ordered the crew to raise the sails and set sail for the unknown.
Remember, the way you use "sail" will depend on the specific context and meaning you want to convey.