Subject–verb agreement
Subjects separated from the verb, each/every, a number of vs the number of — the ITP’s #1 point.
Word form
Noun, adjective, or adverb? -ing or -ed participle? Recognise the form the sentence requires.
Parallel structure
and, or, both… and, not only… but also: coordinated elements must share the same form.
Verb tenses and forms
Tense consistency, since + present perfect, missing main verb, infinitive vs gerund.
Countables, articles and quantifiers
much/many, little/few, amount/number — and the tricky uncountables: information, equipment, research.
Pronouns and reference
Pronoun agreement with its antecedent (everyone… his or her), who/whom/whose, each other.
Prepositions and collocations
caused by, depend on, consist of, similar to… the preposition is learned with its verb or noun.
Word order and adjective placement
strong claws, not claws strong — adjectives before the noun, well-placed adverbs, indirect questions.
Relative clauses and clause connectors
who, which, that, whose, the fact that… connecting clauses to each other correctly.
Comparatives and superlatives
more better is forbidden, the taller of the two, as… as — comparing without mistakes.
Redundancy and superfluous words
repeat again, return back, new innovation — spotting the pleonasms the ITP loves.
Inversions and advanced structures
Not only did he…, reduced clauses, appositions, subjunctive — to aim for 60+ in the Structure section.