Contents -- UNIT 1 PRODUCT PRESENTATION -- Articles -- Nouns -- UNIT 2 PARTS OF A COMPUTER -- Expressions indicating definition, function, and composition -- Present Simple vs Present Continuous -- UNIT 3 COMPUTER HISTORY -- Past Simple vs Past Continuous -- Present Perfect vs Past Simple -- UNIT 4 OPERATING SYSTEMS -- Word formation: adjective suffixes -- UNIT 5 GRAPHICAL USER INTERFACE -- Word formation: prefixes -- Prepositions -- UNIT 6 APPLICATIONS PROGRAMS -- Passive Voice -- Wish -- UNIT 7 PROGRAMMING LANGUAGES -- Reported speech -- Questions -- UNIT 8 NETWORKS -- TOPOLOGIES -- Adjectives -- Pronouns and determiners -- UNIT 9 THE INTERNET -- While or Until -- The Future: will or going to - predictions. -- UNIT 10 DATA SECURITY -- Conditional patterns -- UNIT 11 COMPUTER GRAPHICS -- Modal verbs -- TEST 1 -- TEST 2 -- TEST 3 -- TEST 4 -- TEST 5 -- TEST 6 -- TEST 7 -- TEST 8 -- REFERENCES.