"Once she comes" because the verb must agree with "she" (third-person singular pronoun).
"Once she comes downstairs, we can finish dinner."
"It didn't come up" is correct.
"It didn't come up" is correct. The verb "come" should be in the base form after "didn't."
The correct phrase is "come into effect." This is the standard phrasing when referring to something becoming effective or operative.
Once upon a time comes on every Monday.
Once you have planted the 3 seeds, wait several hours, then go check to see if the seeds have grown into flowers. Once the seeds have grown into flowers, a moshling should come to your Moshling Garden. When the moshling comes to your garden, click on it! If no moshling comes to the garden, then you did not plant the correct combination of seeds.
A full moon comes out once a month
It comes out once it makes its path to the ground.
Santa Claus is know for bringing presents at Christmas time. He comes once a year because Christ's birthday comes once a year.
"there come"
The letter "e" comes twice in the phrase "once in a year".
Yes the moon comes out as full moon once every month
Queen ants come out in the Spring Fall or Summer....The queen comes out in the middle of the day she only comes out once in a year.