English

(a) was sleeping Two actions went on at the same time in the past, joined by "while", so both take the past continuous: "I was reading while she was sleeping."

(c) will have been teaching "By tomorrow" marks a future point and "for 10 years" gives the duration up to it, so the future perfect continuous is used: she will have been teaching them for 10 years.

(c) has passed "Just" shows a recently completed action with present relevance, which takes the present perfect: "She has just passed the exam."

(b) brushes "Daily" shows a habitual action, so the simple present is used. The subject Ram is third person singular, so the verb takes -es: "Ram brushes his teeth daily."

(b) costs "Cost" is a stative verb and a general fact is stated in the simple present. With a third person singular subject it becomes "costs" (its past form is "cost", not "costed"): "The pen costs Rs 100."

(c) what he wanted In reported (indirect) questions the wh-word itself joins the clause, with no extra "that" or "if" and with statement word order: "She enquired him what he wanted."

(c) he asked me if I had to meet him "Must I meet him?" is a yes/no question, so the reporting verb becomes "asked" and "if" or "whether" introduces it. "Must" is reported as "had to" in the past tense. The option is the only one with the correct structure (asked + if + had to meet him); the subject "he" appears to be a misprint for "she".

(d) she told her son not to smoke. A negative imperative ("Don't smoke") is reported with the reporting verb plus "not to" and the infinitive: "She told her son not to smoke." Option (b) is wrong because "forbade ... not to" is a double negative.

(b) cursed Wishing death on someone is a curse, so "cursed" fits the meaning. "Blessed" expresses a good wish, and "commanded" implies an order that no one can obey in this sense.

(c) Anna got married to Jhon "Marry" in the active voice (Jhon married Anna) is rendered in the passive or with "get married" as "Anna got married to Jhon". The preposition used with "married" and "get married" is "to", not "with".