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In foreign language courses, the present simple tense of the infinitive is often referred to as the "dictionary form", as this is the basic form of a verb which is usually presented in dictionaries.
By far the most common form of an infinitive in English language is with the particle "to", such as in "to walk", "to cry", "to eat", "to fear". This is known as the to-infinitive. William Shakespeare used a number of infinitives of this form in one of his most famous soliloquies, the "Soliloquy of Hamlet"
Verbs that are commonly followed by a to-infinitive include: agree, aim, appear, apply, arrange*, ask*, beg*, choose*, consent, decide, demand, desire, expect*, fail, guarantee, hope, intend*, long, negotiate, plan, plead, pledge, prefer*, pretend, resolve, seek, swear, threaten, undertake, volunteer, want*, wish*.
For example:
Those which are followed by an object and a to-infinitive include (in addition to those marked with an asterisk above): advise, allow, challenge, command, compel, condemn, enable, encourage, expect, forbid, force, help, induce, induce, inspire, instruct, invite, oblige, order, permit, persuade, prefer, program, remind, teach, tell, train, urge, warn.
For example:
Some verbs are followed by for + object + to-infinitive. These verbs normally express wanting, and cannot be followed by an object and an infinitive alone (though an infinitive alone may work). These verbs include apply, arrange, ask, call, clamour, long, opt, plead, press, vote, wait, wish, yearn.
For example:
A less common form of the infinitive is with the conditional auxiliary verbs "may" or "might". An example can again be found in the speech by Hamlet referenced above; "What dreams may come ...?". Another example is "we might win".
A third case of infinitive drops the preposition altogether. This is possible when the infinitive form is used in conjunction with a specific set of verbs - these include "feel", "hear", "help", "let", "make" (in the active), "see", and "watch", and dare and need in negative sentences. Examples include:
The last two cases, where the infinitive appears without to, are called the bare infinitive.
In addition to the to-infinitive and the bare infinitive, English also knows other types of infinitive.