Present Perfect Continuous

Правило

Образование

have / has been + V-ing: I have been working. She has been learning English.

• Отрицание: haven't / hasn't been + V-ing.
• Вопрос: How long have you been waiting?

Когда используется

• Длительность до сейчас: I have been working for two hours.
• Видимый результат: It has been raining — the streets are wet.

For и since

for — период (for two hours), since — точка начала (since Monday).