Terms containing that I didn't know

Subject	English	Russian
gen.	I couldn't even imagine that he didn't know it	я и не предполагал, что он этого не знает
gen.	I didn't know that the cost of living was so high here	я не знал, что тут такая дороговизна
gen.	I didn't know that then	тогда я этого не понимал (theguardian.com Alex_Odeychuk)
quot.aph.	that I didn't know	я этого не знал (CNN Alex_Odeychuk)
gen.	your friend is leaving tomorrow. Is that so? I didn't even know about it	Ваш товарищ завтра уезжает? – Да? А я и не знал