My husband is a medical resident he is on a scholarship and is being paid a salary but they have not given him a t4 form. Should i put his salary in the t4 section?

Can he check with his employer to see if a T4 is coming?

No. They said not until 4 1/2 years from now. For the five years he will be working with them, he will not get T4 form until he completes his return of service.

Is he working in Canada?

If has not been given a T4 slip, then you would generally not fill out the T4 slip section. However, you likely do need to report your husbands income.