Rules for Comma Usage. Tip #2: Comma After Introductory Phrase
A comma normally follows participial phrases that introduce a sentence:
Correct: Grabbing her umbrella, Kate raced out of the house. Confused by her sister’s sudden change in mood, Jill stayed quiet.- Схватив зонтик, Кейт выбежала из дома. Смущенная внезапным изменением настроения сестры, Джилл молчала.
When an adverbial phrase begins a sentence, it’s often followed by a comma but it doesn’t have to be, especially if it’s short. As a rule of thumb, if the phrase is longer than about four words, use the comma. You can also use a comma with a shorter phrase when you want to emphasize it or add a pause for literary effect.
Correct: After the show, Cleo will be signing autographs. – После шоу Клео будет раздавать автографы.
But, if there is a chance of misreading the sentence, use the comma:
Incorrect: Before eating the family said grace.
Correct: Before eating, the family said grace.- Перед едой семья произнесла молитву.