Ηχώ (pronounced eehó, in English: echo) is the sound that comes back to you from being in a closeted place or in the mountains etc that repeats you. Ήχος (eehos) is sound.
In Greek, there is a different form of the verb for every grammatical person.
I have= (Εγώ) έχω
You have= (Εσύ) έχεις
He/she/it has=(Αυτός/Αυτή/Αυτό) έχει
We have=(εμείς) έχουμε
You have=(εσείς) έχετε
they have=(αυτοί) έχουν
The pronous I put in parenthesis can be ommited.
Go to settings/control panel, type "language" click on the first one, add language, and search for ελλενικα. When you swap between keyboards, type WIN+SPC
The ending (-ω) of έχω already shows that the subject is εγώ, so you can leave out the subject.