18. If I (to have) an envelope and a stamp, I (to mail) this letter right now. 19 Look at the debris! The building (not/to collapse), if it 01) build) to withstand an earthquake. 20. I have rash all over my body. I wish I (not/to eat) so much chocolate yesterday! Можете ли вы дать немедленный ответ на этот вопрос?