These are three good books for learning Arabic Language for the non-native speakers. But we should pay your attention that they are for who has slightly good knowledge about Arabic and how to pronounce it. We don't claim that you can consider them as an alternative to a teacher but they are good step for who wants to be excellent at Arabic. With these books, there is an Arabic-English glossary confined to the words mentioned in these books, and the author shows in its introduction how to find any word.
This treatise was prepared by the Agency of Islamic Enlightenment in Hajj. Includes a discussion about those things which nullify a person's Islam as well as common errors made by the commonfolk.
Author: Muhammad ibn Saleh al-Othaimeen
Source: http://www.islamhouse.com/p/1377
A small treatise concern knowledge & scholars, its importance & merits.
Author: Abdul Aziz bin Abdullah bin Baz
Publisher: http://www.al-hidaayah.co.uk - Al-Hidaayah Publishing and Distribution Website
Source: http://www.islamhouse.com/p/1257
This is a translation of the beneficial treatise of Imaam Muhammadbin ‘Abdil-Wahhaab, “Shuroot as-Salaat wa Arkaanuhaa wa Waajibaatuhaa.” In this short treatise, Imaam Muhammad bin ‘Abdil-Wahhaab, may Allah have mercy on him, briefly outlines the nine conditions for the acceptance of one ’s prayer, as well as the fourteen pillars and eight requirements of the prayer, mentioning some of their proofs and evidences from the Book and the Sunnah.
Author: Muhammad Bin Abdul Wahhab
Reveiwers: Muhammad AbdulRaoof
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Author: Mane' Bin Hammad Al-Juhani
Brief guide concerning the fundamentals of Islam.
Author: Naasir Bin Abdulkarim al-Aql
Source: http://www.islamhouse.com/p/1295