Simple future tense:single verb

I will = خواهم /kha:ham/
You will = خواهي /kha:hi/
He/She will = خواهد /kha:had/
We will = خواهيم /kha:him/
You will = خواهيد /kha:hid/
They will = خواهند /kha:hand/

put the verb (in simple past tense without adding its subjective suffix) after the above phrases to change it into simple future tense.

I will write = خواهم نوشت /kha:ham nevesht/
You will write = خواهي نوشت /kha:hi nevesht/
He/She will write = خواهد نوشت /kha:had nevesht/
We will write = خواهيم نوشت /kha:him nevesht/
You will write = خواهيد نوشت /kha:hid nevesht/
They will write = خواهند نوشت /kha:hand nevesht/

Note: the main verb ( نوشت nevesht) doesn't change.