YOU SAID:

I have to go mow the lawn and mow the lawn lawn and mow the yard lawn and mow the lawn

INTO JAPANESE

私は芝生を刈り、芝生を刈り、庭の芝生を刈り、芝生を刈らなければなりません

BACK INTO ENGLISH

I have to mow the lawn, mow the lawn, mow the lawn in the garden, mow the lawn

INTO JAPANESE

私は芝生を刈る、芝生を刈る、庭の芝生を刈る、芝生を刈る必要があります

BACK INTO ENGLISH

I need to mow the lawn, mow the lawn, mow the lawn in the garden, mow the lawn

INTO JAPANESE

私は芝生を刈る、芝生を刈る、庭で芝生を刈る、芝生を刈る必要があります

BACK INTO ENGLISH

I need to mow the lawn, mow the lawn, mow the lawn in the garden, mow the lawn