Use a Greek-to-English/English-to-Greek dictionary to translate the phrase word-for-word. According to on-line tips provided by Gregory R. Crane, a professor at Tufts University, translating Greek to English works best when you translate one word at a time, something a Greek-to-English/English-to-Greek dictionary will help you do.
Use a book of Greek phrases to translate entire phrases, which is quicker than translating word-for-word. There are many books for travelers and those new to Greek language. Check the travel and language sections of book stores and on-line booksellers.
Use Internet search engines to find free language translators. These free sites allow you to enter a word or phrase in many languages and translate them into English. The reverse works, too. The sites can translate English into many other languages.