I'll write an essay about "telephone vs.e-mail".
By telephone, we can get a reply on the spot. So, when we are in a hurry, telephone is useful.
And we can hear voices of parties. So, we can find whether they are fine or not.
These are advantages of telephone.
But, if we are not in ahurry, we have to consider when to call. We have
to avoid calling early in the morning or at midnight. This is a
disadvantage of telephone.
As for e-mail, we can e-mail something any time. Because e-mail does not wake parties up.
And we can tell them what we hesitate to tell on the phone. Moreover we can e-mail pictures, voices, and sounds too.
These are advantages of e-mail.
But we can't get a reply on the spot. So, when we are in a hurry, e-mail is not useful. This is a disadvantage of e-mail.
In conclusion, I think, it is important to change telephone and e-mail to suit the occasion.
Thank you .