Template

<form [formGroup]="userForm" (ngSubmit)="onFormSubmitted(userForm)">
  <label>
    <span>Name</span>
    <input type="text" formControlName="name" placeholder="Name" required>
  </label>
  <div>
    <label>
      <span>Email</span>
      <input type="email" formControlName="email" placeholder="Email" required>
    </label>
  </div>
  <div formGroupName="address">
    <label>
      <span>Country</span>
      <input type="text" formControlName="country" placeholder="Country" required>
    </label>
    <div>
      <label>
        <span>City</span>
        <input type="text" formControlName="city" placeholder="City" required>
      </label>
    </div>
  </div>
  <input type="submit" [disabled]="userForm.invalid">
</form>