Complete the sentences. Use the correct Present Perfect Continuous form. 1. I＿ (study) English for 5 years. 2. They ＿ (understand) the lesson. 3. My math's teacher ＿ ＿ (teach) Maths for 4 years. 4. Max, Justin and Marc ＿ ＿(live) here for 5 years. 5. I＿ (do) my homework today. 6. My mother ＿ ＿ (tell) I must study more. 7. Mohammed ＿ ＿ (study) engineering at university. 8. Miriam ＿ ＿ (work) in this company since 2009.